Source: Chinese trial draft v3.7 (2026-10-25). English translation v2 (adapted for a general Western readership)
Legend: ● established ｜ ◐ disputed ｜ ○ inferred — superscript numbers refer to the Notes section at the end of the chapter.
Open a map of China and look at the southwest corner: that vast brown mass is the Qinghai–Tibet Plateau. It covers roughly a quarter of China's land area, with an average elevation above 4,000 meters — the "Roof of the World."¹ The merchant caravans of the Tea Horse Road, puffing their way over the passes, walked on it. The border garrisons, gazing west, gazed at it. Neolithic farmers, the tsenpos of the Tibetan Empire (tsenpo, the title of its rulers), Mongol post horses, the banners of Qing armies — all of them crossed this plateau in turn. Every story that follows unfolds on a stage that elevation, temperature, and mountain ranges had already set in place.
This chapter introduces no historical figures. It does only three things: map out the geography of this stage, work out how many people it could feed, and delimit the three great regions later known as Ü-Tsang, Kham, and Amdo. By the end of the chapter you will see that the history of every subsequent chapter has its foreshadowing somewhere on this map.
Imagine you are a herder pushing open the door of your tent at dawn. In front of you are pasture and a few dozen yaks — but you are standing higher than anyone on the plains: 4,500 meters above sea level, thin air, and before the sun rises your breath freezes into frost. Behind you stretches Changtang, the seemingly boundless high cold wilderness of northern Tibet. Look south, and a white line runs along the horizon: the Himalayas. All along, you have been living between a wall and a wilderness.
What does this stage look like? First, the map.
Figure 0-1. Geographic sketch map of the Tibetan regions. First, the compass points: the plateau as a whole sits in China's southwest corner, with the Pamirs to the west, Xinjiang to the north, and Sichuan and Yunnan to the east. How to read this map: pick out three things first — Ü-Tsang, in the middle Yarlung Tsangpo river valleys of the south; Kham, in the east, in the valleys of six great south-flowing rivers; and Amdo, in the northeast, around Qinghai Lake and the Hehuang valley (where the Yellow River meets its tributary, the Huang Shui, in the region of present-day Xining, Qinghai). The gold area in the south is Ü-Tsang; the vast pale wilderness to its north is Changtang. Then look at the bundle of great rivers flowing south in parallel in the east — the "Six Rivers" country of the Hengduan Mountains. The Ü-Tsang river valleys are the green east–west corridor on the map, the plateau's largest farming belt, where every political center from the Tibetan Empire onward took root. In the northeast corner, the Qaidam Basin and the Hexi Corridor are the plateau's two doors to inner China. This is a schematic illustration, not a standard map, and is not to be used as a basis for boundary demarcation.¹²
Now pull the camera back. The Qinghai–Tibet Plateau is not a flat tabletop: it is an enormous sheet of paper that has been squeezed, uplifted, and carved again and again. Its southern rim is the Himalayan range, stretching more than 2,000 kilometers east to west, crowned by Mount Everest at 8,848.86 meters.² Beyond the southern rim the land falls away abruptly, dropping to the Ganges Plain within a few hundred kilometers. The northern rim meets the Kunlun and Qilian ranges and, beyond them, the Tarim Basin and the Hexi Corridor; the eastern rim is the Hengduan Mountains — a leading character in the second half of this book.
For the people on the plateau, this frame meant two things. First, the rim is not a gentle slope but a wall: the southern side is especially sheer; historically there were only a handful of crossings over the Himalayas, and most were passable only seasonally.³ Second, the wall is not sealed: to the northeast, the Hexi Corridor leads to inner China; to the east, river valleys lead down to the Sichuan Basin. These two directions of passage will appear again and again in Chapters 4 and 12.
Which raises the question: inside the wall, what is it like?
Start with a bowl of tsampa — roasted highland barley flour, the staple food of the plateau. Roast the barley, grind it, knead it with a little liquid, and you can eat it on the spot. But barley does not grow just anywhere: it needs a river valley, not too high, with frost that does not come too early. Across all of southern Tibet, the valleys that fit that description amount to essentially one: the Yarlung Tsangpo.
The Yarlung Tsangpo — known downstream as the Brahmaputra — runs from west to east across southern Tibet, and its middle course has carved out a broad valley corridor, the region usually called "one river, two tributaries": the middle Yarlung Tsangpo together with its tributaries the Kyi Chu (on which Lhasa stands) and the Nianchu River (the tributary valley south of Shigatse).⁴ The valley floors here lie mostly between 3,500 and 4,000 meters — two to three thousand meters lower than the surrounding mountains — with light winds, long sunshine hours, and a relatively long frost-free season. It is the most important agricultural belt in all of southern Tibet.
The Lhasa valley today sits at about 3,650 meters.⁵ Barley, wheat, and rapeseed grow on its floor — and it is also home to Tibet's most densely populated city. On either side, the mountains climb swiftly past 5,000 meters, and the vegetation thins from meadow to bare scree. This "vertical compression" is the basic grammar of plateau geography: drive for half a day, and you have traveled from temperate zone to polar.
Figure 0-2. Vertical zonation sketch. From the valley farming belt upward, through meadow and steppe zones, to the zone of permanent snow and ice. Schematic only; zones not to scale.
A one-sentence preview of the role this valley corridor would later play: the Tibetan Empire rose from here (Chapter 2), and the political-religious centers of the Sakya, Phagmodrupa, and Ganden Phodrang regimes all stood on this corridor and its extensions (Chapters 4–7). The reasons why Ü-Tsang is Ü-Tsang are laid in the ground in this very section.
Back to our herder. The land he lives on is called Changtang — what people usually mean by "northern Tibet." "Changtang" is Tibetan for "northern wilderness," and the name is the best possible self-introduction: an endless open plain spread across the plateau's due north. It is the most extensive single stretch of the plateau's interior, averaging above 4,500 meters, with a cold high-altitude climate, scant rainfall, and vegetation of alpine steppe and desert steppe⁶ — a land dotted with clusters of lakes, much of it still empty of human habitation. A herder here can do one thing only: herd. Yaks and Tibetan sheep can eat the short, sparse grass; crops cannot be grown — before the grain can ripen, frost has already turned the nights white.
Put Changtang and Ü-Tsang side by side on one map and the contrast leaps out: Ü-Tsang is the farming belt in the southern valleys, Changtang the herding belt on the northern wilderness — one farms, one herds; together they form the two great internal blocks of the plateau. You will meet both names many times in the chapters ahead.
Changtang is vast, yet it cannot support a dense population. Its historical role was this: the stage of pastoral tribes, the hinterland of the through-routes, and, after the Mongol era, a stretch crossed by the relay-station network (Chapter 4 and Chapter 7 will show how pastoral units such as the Thirty-Nine Horde of the Hor were drawn into systems of governance). The carrying capacity of the pasture — how many livestock a given grassland can support at most — set the ceiling on what livelihoods this land could sustain. That judgment stays on the table for now; we will lay it out and do the arithmetic at the end of the chapter.
Walk east from Changtang and the scenery changes abruptly. The mountains no longer line up sideways; they are cut vertically: the great rivers all swing to a north–south course, mountain clamping river and river slicing mountain, flowing south in parallel. The Nu (Salween), Lancang (Mekong), Jinsha (Upper Yangtze), Yalong, Dadu, and Min rivers — hence the name "Six Rivers region," while the range itself takes its name, Hengduan ("cutting across"), from the way it severs east–west travel.⁷ In northwestern Yunnan, where the Jinsha, Lancang, and Nu run side by side without converging, the area was inscribed on the World Heritage List in 2003.⁸
The relief here is extreme: the valley floor can be a hot, dry gorge while the summits above hold snow all year. On the terraces and small basins along the valley sides live distinctive local culture groups — the Jiarong, Muya, Baima, and others — each of which this book will treat in its own chapter. The Karuo site of Chapter 1 lies in this zone, at Chamdo (a city in eastern Tibet, hard against the Sichuan and Yunnan borders).⁹
The six great gorges of the Hengduan Mountains are natural north–south corridors: north to Qinghai and southern Gansu, south to Yunnan, east to the Sichuan Basin. Tea went up these valleys; horses came down them — the Tea Horse Road of Chapter 12 runs mainly through these very valleys.
The plateau's northeast corner holds the Qaidam Basin, at roughly 2,600 to 3,000 meters elevation, ringed by mountains, its floor dotted with salt lakes and desert, its rim of oases since antiquity a string of supply points along the through-routes.¹⁰ Farther northeast, squeezed between the Qilian Mountains and the desert, runs the famous Hexi Corridor — the four oasis towns of Wuwei, Zhangye, Jiuquan, and Dunhuang strung from southeast to northwest across present-day western Gansu. This was the throat through which inner China reached the Western Regions.
For Tibetan history, the meaning of this unit lies in one word: "margin." Changtang sustains herding, Ü-Tsang sustains farming; the Qaidam and Hexi margin sustained relay stations, markets, and armies. The tug-of-war between Tibet and Tang China over Qinghai (Chapter 2), the Mongol entry into Qinghai (Chapter 6), the Qing escort of the Seventh Dalai Lama to Lhasa (Chapter 7) — whenever military or political power moved in or out of the plateau, it went this way. When Sakya Pandita, a high lama of the Sakya school of Tibetan Buddhism, traveled north to Liangzhou (present-day Wuwei, Gansu) to meet the Mongol prince Godan in 1247 (Chapter 4),¹¹ the meeting place was chosen at the eastern end of the Hexi Corridor. Geographically, the earliest link between the plateau and inner China was soldered at this corner.
Figure 0-4. The plateau's two doors. Two doors to the outside world: the northeast door — the Qaidam–Hexi line, by which armies and envoys mostly came and went; the east door — the Hengduan valleys, by which the tea-horse trade mostly flowed. Beyond the doors lies a different world: the northeast door opens onto Gansu and the heartland of inner China; the east door onto Sichuan and Yunnan. Directional sketch only, not to scale.
The four sketches in this chapter each say one thing: Figure 0-1 draws the frame of the whole stage; Figure 0-2 draws the vertical compression inside the valleys; Figure 0-3 (next section) draws the three lines that elevation presses out; Figure 0-4 draws the two doors to the outside. Fit the four together and you have the plateau as a whole. The question to answer next: what exactly does elevation decide?
That bowl of tsampa now serves a second purpose. In the Lhasa valley it is daily bread; but carry the same bag of barley seed three hundred kilometers north into Changtang, scatter it in a field, and at harvest time you will most likely find a patch of frost-blighted shoots. Why? The answer hides in a simple fact: temperature falls as elevation rises — broadly speaking, about six degrees Celsius per thousand meters.¹³ The plateau's interior is therefore short of heat, and across most of it the frost-free season reliable enough for a crop to ripen is very short.
And so three invisible lines appear on the plateau. What the three lines look like — first, the map.
Figure 0-3. The three altitude lines. From bottom to top: the farming–herding line — the upper limit at which barley and other crops can ripen; below it farmland, above it herding only. The arable line — the thin band of cultivable ground from valley floor to mid-slope. The population line — the boundary along which people cluster tightly to the valleys. All three lines tighten as elevation rises. Schematic only, not precise contour lines.
The first line divides farming from herding. Barley is the hardiest of the plateau's staple grains and climbs higher than any of them, yet even barley struggles to ripen in the cold zones above 4,500 meters.¹⁴ Below the line, farmland; above it, herds.
The second line bounds cultivation. Only the valleys hold substantial farmland, and only in a thin layer from valley floor to mid-slope. On the map, Ü-Tsang's "farming region" is no more than slender green strips inside the valley corridors.
The third line bounds population. The plateau is vast and thinly peopled — and its people are not spread evenly but pressed tight against the valleys. Tibet's population today remains heavily concentrated in the "one river, two tributaries" region and the eastern valleys.¹⁵ The reason is not complicated: where the food grows, there the people are.
Overlay the three lines on the map, and what do you get? The plateau's farming settlements look like a handful of green islands scattered across a brown waste: the middle Yarlung Tsangpo valley forms the longest string; the Hengduan valleys in the east and the Hehuang valley in the northeast hold a few more — each separated from the others by wide stretches of pasture and wilderness.
Seeing this picture, let's pause and think together: if every habitable valley is ecologically a unit unto itself, might the plateau's historical political organizations have commonly grown from just such a "valley unit" as their base, then strung these islands together by means of the transport lines? Whoever controlled the largest string of islands plus the most critical passages would be the one entitled to speak of "unifying the plateau." Hold that question mark here; we will face it squarely at the end of the chapter.
One more thing must be said: everything described above sketches the "norm," not a constant. Through historical times the plateau and its neighboring regions have known fluctuations of temperature, rainfall, and humidity, and scholarly debate over their magnitude and impact is still ongoing.¹⁶ As for which fluctuations caused what, this book will sort it out case by case in each chapter: what the sources establish gets stated as fact; what can only be inferred gets presented as inference — the two are never mixed.
Farming regions, herding regions, and corridor zones each grew their own form of society. The valley farming regions could accumulate grain surpluses, sustain monasteries and administrative organs, and hold stable settlements. The cold pastoral regions moved with water and grass, organized by tribe — manpower dispersed but highly mobile. The towns and markets of the corridor zones lived on the transit of goods and cared most about open, orderly roads.
These three faces are not categories from a textbook; they are visible on the plateau today — the barley fields of the farming valleys, the tents and yak-drive migration routes of the pastoral regions, the hub cities of Kangding and Xining — each continuing an ancient logic of livelihood.¹⁷
There is an old saying in Tibet: "Ü-Tsang is the realm of religion; Amdo, the realm of horses; Kham, the realm of men." Ü-Tsang excels in religious authority, Amdo is famed for fine horses, and Kham is known for its bold and forceful men.¹⁸ A single proverb, and the character of all three regions is laid out. Note well: this threefold division rests on a combination of geography, livelihood, and human culture — it is not a straight line drawn by administrative fiat.
First, the geographic scope of each. Ü-Tsang means the middle Yarlung Tsangpo basin — the central part of today's Tibet Autonomous Region (Tibet Autonomous Region: the present-day province-level administrative region of China), the line running through Lhasa, Shannan, Shigatse, and Ngari, and the political-religious heartland since the time of the Tibetan Empire. Kham lies roughly across the Hengduan Mountains, spanning today's Chamdo in Tibet, Garzê in Sichuan, Déqên in Yunnan, and Yushu in Qinghai.¹⁹ Amdo occupies the plateau's northeast: most of present-day Qinghai (Yushu excepted), the Gannan area of Gansu, and the Aba area of Sichuan.²⁰
Take the name "Ü-Tsang" apart. It is a compound of two words: "Ü" (Tibetan dbus, "central"), for the Lhasa–Shannan area, commonly called "Outer Tibet"; and "Tsang" (gtsang), for the Shigatse–Gyantse area, commonly called "Inner Tibet." (A note for readers coming to this material fresh: the labels "Outer Tibet" and "Inner Tibet" were the terms used in Western diplomatic documents of the early twentieth century — most famously at the 1914 Simla Convention between British India, Tibet, and the Republic of China — and, although they derive from the earlier Qing-era usages "前藏/后藏," the proposed Outer/Inner division was never recognized by China; they are used here only as period vocabulary, not as settled political fact.)³³ Together the two characters name the plateau's political and religious core since the Tibetan Empire, covering roughly the west-central part of today's Tibet Autonomous Region. You already met its northern neighbor in the previous section: Ü-Tsang farms the southern valleys, Changtang herds the northern wilderness — one farming, one herding, a matched pair.
The capital behind Ü-Tsang has already been laid out over the last two sections: the middle-Yarlung Tsangpo valley corridor, the plateau's largest farming belt, able to feed the densest population and accumulate the largest grain surplus. With surplus came the means to sustain a full-time clergy and administrative class; with scale, the costs of statehood could be spread. From the Yarlung tribe — risen in the Yarlung valley south of Lhasa — to the Tibetan Empire, from Sakya to the Ganden Phodrang, Ü-Tsang's central position ran unbroken.²¹
But note: Ü-Tsang's "central" position was made by history, not decreed by geography. Chapter 2 returns to this when the Tibetan Empire chose its capital at Lhasa — beyond the valley conditions there were also political causes: succession struggles, the geometry of tribal alliances. Geography offered the options; people picked one.
Amdo faces a different set of geographic conditions: the grasslands of the Hehuang valley and around Qinghai Lake, slightly lower than Changtang, with better pasture — from of old a herding country, which is why the proverb calls it the "realm of horses." Amdo is also the corner of the plateau closest to inner China: follow the Yellow River and the Huang Shui east through the Hehuang valley, and you arrive at the Loess Plateau.
That position assigned Amdo two roles in this book. First, it was often the first station of contact between plateau and interior: the Tang–Tibet rivalry in Qinghai, the tribute-and-trade relations between the Gusiluo regime (the rulers of the Qingtang polity in the Hehuang region) and the Song,²² the Ming court's investitures of Hehuang clergy and chieftains, the monastery networks of Kumbum and Labrang under the Qing — all happened in this corner. Second, Amdo developed a social form of its own — "grassland tribes plus great monasteries" — visibly different from Ü-Tsang's valley-based political-religious order; Chapters 7 and 11 take up that difference in detail.
Kham is scattered through the six deep gorges of the Hengduan Mountains — the most fragmented of the three regions. The habitable benches along the valley walls are narrow; villages and tribes are cut off from one another by high mountains and raging rivers; the terrain is naturally hostile to any unified polity. The historically dense mosaic of Kham tribes, with chieftains and local lords each holding their own patch, is the social shadow cast by this fractured geography.²³
But fragmentation does not mean isolation. The six south-flowing valleys are natural corridors, and they made Kham the plateau's most commercially active zone: tea entered Tibet through here, and hub cities like Kangding (present-day Kangding, Sichuan; formerly known as Dajianlu) rose on the tea trade.²⁴ The proverb calls Kham the "realm of men," writing into the name a regional character — vigorous, martial, true to its word. The proverb's picture is a generalization, with the exaggeration generalizations carry; this book takes it as a pointer, not a stereotype, and lets the particular people and events of later chapters do the depicting.
The limits of this threefold division must be stated plainly. First, the three regions are not uniform inside: Ü-Tsang contains valley farmland and the high plateau of Ngari; Kham contains farms, pastures, and gorge societies. Second, the borders were always blurry: the people of Yushu call themselves Khampa, but Yushu belongs administratively to Qinghai; the Jiarong sit culturally between Kham and Amdo. Third, the threefold scheme is a framework drawn up by later hands; people in historical times did not necessarily sort themselves by it.
This book uses the threefold division purely for clarity of writing and reading: giving all three regions their due keeps Kham and Amdo from being swallowed by the Ü-Tsang narrative. One sentence is enough to remember: the boundary lines on a map are drawn by people, and human activity never strictly kept to them.
The plateau has more than one good valley. The Nianchu valley is a farming belt too; the Yarlung valley was the cradle of the Tibetan royal house; Neolithic sites around Shannan show farming settlement began there remarkably early.²⁵ So the question: why, of all the valleys, was it the Lhasa valley that became the plateau's political and religious center?
First, the facts. The Lhasa valley sits at about 3,650 meters — on the low side among the Ü-Tsang valleys. The valley is impressively wide, with relatively concentrated arable land; the Lhasa river's flow is steady; sunshine is abundant — Lhasa's annual sunshine hours rank among the highest in all of China, and it has long been called the "City of Sunlight."²⁶ Now position: the Lhasa valley sits at the northern end of the middle-Yarlung Tsangpo farming belt; northward, mountain passes lead into Changtang; northeastward, it links to the roads toward Qinghai.²⁷
Now, armed with these two conditions, walk through the other valleys one by one. The Lhasa valley combines "foothold of the largest farming belt" with "starting point of the northbound corridor" — while every other valley gets one or the other. The Nianchu valley is rich but tucked away in Inner Tibet; the Yarlung valley is the courtyard where the dynasty started, not the reception hall from which it governed. Moving the political center to Lhasa in the time of Songtsen Gampo (the exact year of the move is variously given²⁸) amounted to seating the capital at the intersection of the plateau's agricultural geography and its transport geography. You see — asked to this point, the answer almost surfaces on its own. Chapter 2 will verify this thread with historical evidence.
Consider one piece of terrain: at the Sichuan–Tibet border, the Jinsha River slices through high mountains, its surface at around 2,000 meters while the ridges on both sides rise above 4,000.²⁹ In terrain like that, a road has no choices — it must follow the river. So the valleys of the six great rivers have been corridors of human movement since prehistory: the eastern-rim cultural connections of Chapter 1 and the tea-horse trade network of Chapter 12 both unfold along these valleys.
Corridor geography shaped Kham society's character. First, corridor economy: any settlement at a valley confluence or a strategic pass prospered on the traffic of people and goods — Dajianlu is the most famous example. Second, tribal dispersal: the corridor brought outsiders in while the broken terrain kept local groups apart; the two effects compounded, producing Kham's pattern of "many small units, tightly interconnected" — tribes small in size, but every one of them fluent in trade and negotiation. Third, military and political openness: whenever a strong power moved into or out of the plateau, the Hengduan valleys were both its entrance and its hallway — Mongol-era appanages, Ming investitures, and Qing administration all had to be planted here.³⁰
The same valley is a field to the farmer, a road to the herder, a source of wealth to the caravan, a hallway to the army. A corridor takes no sides; it merely translates the geography of the plateau's eastern rim into one plain constraint: whoever wants to cross or work the eastern rim must play by the logic of the valleys. That sentence describes geography, not laws of history — how it bears out in each chapter's evidence, see the chapters ahead.
Now let's assemble what this chapter has shown and try to reckon one large account: how the plateau's geography and ecology pre-set the stage — and the boundaries — of all the history that followed.
The reckoning starts from three sets of facts already laid on the table: first, the plateau's farmable land is concentrated in a few valleys, with population and grain surplus anchored to these "resource islands" (Sections 1–2); second, Changtang and the other high cold pastures support only a pastoral livelihood and tribal organization (Section 1); third, the plateau's bulk trade with the outside world depended on a few fixed corridors — the Qaidam–Hexi and Hehuang routes to the northeast, the Hengduan valleys to the east (Section 1).
And the reckoning can proceed step by step. Step one: carrying capacity determines a polity's base. Only a political body that could accumulate grain surplus in the valleys could sustain a standing clergy and administration. Check this against the record: every full-scale polity in the plateau's history — the Tibetan Empire, Sakya, Phagmodrupa, Ganden Phodrang — without exception seated its center on the Ü-Tsang valley belt, exactly what the structural logic of "surplus feeds kingship" predicts. Step two: the balance of strength between herders and farmers shaped political form. Pastoral populations are mobile and dispersed — hard pressed to generate kingship from within, yet capable of becoming a major political variable when combined with outside forces. From this angle, the repeated intervention of Mongol power in plateau politics after the Mongol era is precisely the plateau's version of a structure common across Eurasia: farming regions produce regimes, pastoral regions produce cavalry. Step three: corridors determined the direction of connection. The plateau's external economy depended on tea from outside and horses from within, and the tea-horse trade fixed those economic needs onto a few routes; economic connection then became one of the material foundations for political incorporation into central governance — from the Yuan dynasty's establishment of the Xuanzheng Yuan (Bureau of Buddhist and Tibetan Affairs), when Tibet came under central administrative jurisdiction, through the continuously institutionalized investitures and governance of the Ming and Qing. Geography and economics explain why connection was possible; the history of governance is another matter, written out chapter by chapter from the evidence.
Three steps taken, look back at the account: carrying capacity gave polities their base; corridors gave connection its direction; the pastoral lands supplied the variable of force. Geography provides the stage, not the script — but every act performed on that stage first had to land on these boards.
The prologue has no "Where We Are" page — it is itself the coordinate for every chapter that follows. Before closing, let's shape the keys and put them in your hand — including the answer to the question left open in Section 2.
The first key: carrying capacity. Every settlement, polity, and monastery on the plateau stood on the surplus of valley agriculture. Whenever you encounter the Tibetan move of capital, the Sakya investiture, the building of the Ganden Phodrang, ask first: which valley fed it?
The second key: corridors. The Qaidam–Hexi line to the northeast and the Hengduan valley line to the east were the two doors through which force and goods entered and left. The Tang–Tibet contest, the Mongol entry into Qinghai, the Qing armies bound for Lhasa, the tea climbing uphill — all went through those two doors. Yuan relay stations, the Qing amban in Lhasa (the amban was the imperial commissioner stationed in Lhasa to represent the Qing court), the Qinghai–Tibet highway and railway built in the twentieth century³¹ — governance and technology kept rewriting the cost of the corridors, but the doors never moved.
The third key: the regions. Ü-Tsang's centripetal character, Amdo's grassland-and-gateway character, Kham's corridor character — these pre-assigned each region its role in every chapter to come. Don't be surprised by "Kham's many tribes"; don't go hunting for a separate cause behind "Amdo's monastery networks" — the geographic groundwork was laid in this chapter.
Put the three keys together and one sentence remains the most important of all: geography provides the stage, not the script. Carrying capacity drew the boundary of the possible; what happened inside that boundary — why the Tibetan Empire rose and why it fell, how Sakya allied with the Mongols, how the Gelug school won out in competition, how Tibet traveled from the Tang–Tibet treaty to the Yuan's Xuanzheng Yuan to the incorporation of Tibet into the People's Republic of China in 1951 (known in Chinese official usage as hépíng jiěfàng, usually rendered "peaceful liberation") — every one of those turns was decided by institutions, by people, and by concrete historical conditions. That is the work of the thirteen chapters that follow. You will not find these answers on the map — but without this map, the answers would be far harder to understand.
In the next chapter, we walk toward the first wisp of cooking smoke on this stage: where the plateau's prehistoric people came from, who lived in the stone houses of Karuo, and what memory lies behind the legends of the royal line.
Note on the notes: superscripts in the text refer to the numbered notes below. Each note records its source direction and a three-state judgment — established = supported fact; disputed = contested between accounts; inferred = inference. Entries marked “verified 2026-10-25” were checked online on that date against the sources named; a small number of items still pending final confirmation are tracked in the project's internal ledger and will be resolved before publication. Chinese source titles are retained for traceability.
This chapter laid out the four landform units in turn (the Himalaya–Yarlung Tsangpo southern-rim valleys, the Changtang grassland, the Hengduan valleys, and the Qaidam–Hexi margin), showed how elevation and temperature fix the boundaries of farming, cultivation, and settlement, sketched the three livelihood forms of "valley resource islands + pastoral tribes + corridor trade," and introduced the geographic foundations and human character of Ü-Tsang, Kham, and Amdo under the standard threefold division. Notes 16 (climate impacts), 19 and 20 (regional scopes), and 28 (year of the move of capital) are disputed-state items; each will be resolved against the open-questions list before final publication.
① The upper altitude limit of barley cultivation and the exact position of the farming–herding line: standard accounts differ, and this draft fixes no number (see Note 14). The author prefers to adopt upper-limit data from an authoritative agricultural-geography source, to be added as a footnote once verified. ② Climate-change impacts on plateau societies in historical times: scholars hold differing views (magnitude of impact, transmission mechanisms); this draft only touches on the matter and adopts no side as settled; at final publication the plan is to present the competing accounts side by side on the basis of an authoritative review. ③ The delimitation of Kham and Amdo: authoritative accounts differ; this draft uses the rough standard boundaries, and one account (preferably one from standard Tibetan-studies regional studies) will be selected and applied consistently book-wide at final publication.
| Chinese | English | First-occurrence handling |
|---|---|---|
| 青藏高原 | Qinghai–Tibet Plateau | Introduced in the chapter opening as "the vast brown mass in China's southwest corner"; commonly known to Western readers, no gloss beyond location |
| 世界屋脊 | Roof of the World | Established English epithet; used directly¹ |
| 吐蕃 | Tibetan Empire | Per translation spec; "tsenpo" glossed at first use in the chapter introduction |
| 赞普 | tsenpo | Untranslated title (Wylie btsan po), italicized, glossed "the title of the empire's rulers" at first use (chapter introduction) — finalized in v2 |
| 卫藏 | Ü-Tsang | Established spelling per spec; etymology (dbus + gtsang) unpacked in III.2 and Note 33 |
| 前藏／后藏 | Outer Tibet / Inner Tibet | Calqued gloss at first use (III.2, Note 33); v2 adds a first-occurrence note that the terms stem from the 1914 Simla Convention vocabulary and were never recognized by China |
| 康区 | Kham | Established; scoped in III.1 |
| 安多 | Amdo | Established; scoped in III.1 |
| 羌塘 | Changtang | Transliteration + gloss "Tibetan for 'northern wilderness'" (Section I.3), per locked record |
| 雅砻 | Yarlung | Locked per name table (作者 2026-10-25 定)； glossed as "the Yarlung valley south of Lhasa" at first use (III.2, Case Study 0-1) |
| 雅鲁藏布江 | Yarlung Tsangpo | Established Tibetan-derived name; glossed as "known downstream as the Brahmaputra" (I.2) |
| 逻些／拉萨 | Lhasa | Established (T-004); "Lhasa" used throughout, archaic 逻些 rendered "Lhasa" with historical framing |
| 横断山 | Hengduan Mountains | Transliteration + gloss "named for the way it severs east–west travel" (I.4) |
| 河湟谷地 | Hehuang valley | Transliteration + locational gloss (Yellow River / Huang Shui, near Xining) at first mention (Figure 0-1 caption) |
| 河西走廊 | Hexi Corridor | Established usage; glossed as the oasis corridor of western Gansu (I.5) |
| 柴达木盆地 | Qaidam Basin | Established usage (I.5) |
| 昌都 | Chamdo | Standard spelling; glossed "a city in eastern Tibet…" (I.4) |
| 打箭炉 | Dajianlu | Transliteration, glossed "formerly known as Dajianlu… present-day Kangding" (III.4) |
| 凉州 | Liangzhou | Transliteration, glossed "present-day Wuwei, Gansu" (I.5) |
| 唃厮啰 | Gusiluo | Transliteration per spec, glossed "rulers of the Qingtang polity in the Hehuang region" (III.3) |
| 萨迦班智达 | Sakya Pandita | Established scholarly form, glossed "a high lama of the Sakya school" (I.5) |
| 松赞干布 | Songtsen Gampo | Established (T-001), used directly (Case Study 0-1) |
| 阔端 | Godan | Standard Mongol-name spelling, glossed "the Mongol prince" (I.5) |
| 萨迦／帕木竹巴／甘丹颇章 | Sakya / Phagmodrupa / Ganden Phodrang | Established spellings per spec (T-012, T-013, T-015) |
| 帝国时代政权名（元代） | Yuan dynasty | Standard Western usage; "the Mongol era" used in narrative for readability |
| 宣政院 | Xuanzheng Yuan (Bureau of Buddhist and Tibetan Affairs) | Pinyin + official-style gloss at first use (Inference Panel 0-1) |
| 驻藏大臣 | amban | Glossed "the Qing amban (imperial commissioner) in Lhasa" (Section IV) per spec — finalized in v2 |
| 茶马古道 | Tea Horse Road | Established English name (chapter opening) |
| 糌粑／青稞 | tsampa / highland barley | Transliteration + explanation "roasted highland barley flour" (I.2); "highland barley" used consistently for 青稞 |
| 卡若 | Karuo | Transliteration, glossed as a prehistoric site (I.4, IV) |
| 嘉绒／木雅／白马 | Jiarong, Muya, Baima | Transliterations, framed as "distinctive local culture groups" (I.4) |
| 一江两河 | "one river, two tributaries" | Literal rendering in quotes, unpacked in the same sentence (I.2) |
| 六江流域 | "Six Rivers" region | Literal rendering, rivers individually named with established English names (Nu/Salween etc.) (I.4) |
| 三江并流 | Three Parallel Rivers | UNESCO official English name (Note 8) |
| 霍尔三十九族 | Thirty-Nine Horde of the Hor | Functional translation + transliteration frame (I.3) |
| 转场 | migration routes (yak-drive) | Descriptive rendering (II.4) |
| ●实／◐疑／○测 | established / disputed / inferred | Fixed labels per spec, kept in notes; legend at page top |