China’s most important border is imaginary: the Hu Line

First drawn in 1935, Hu Line illustrates persistent demographic split – how Beijing deals with it will determine the country's future.

The western part of China, more than half its territory, holds only 6% of its population. The ‘Hu Line’ separates the country’s wild and empty west from the vastly more populous east.

The western part of China, more than half its territory, holds only 6% of its population. The 'Hu Line' separates the country's wild and empty west from the vastly more populous east.

Credit: Tomaatje12, CC0 1.0 – Public domain.
  • In 1935, demographer Hu Huanyong drew a line across a map of China.
  • The 'Hu Line' illustrated a remarkable divide in China's population distribution.
  • That divide remains relevant, not just for China's present but also for its future.


Consequential feature

A woman stands on an embankment of the Amur river, with Chinese town of Heihe seen in the background, in the Russian far-eastern town of Blagoveshchensk, on August 17, 2020. (Photo by Dimitar DILKOFF / AFP) (Photo by DIMITAR DILKOFF/AFP via Getty Images)

A bather in Blagoveshchensk, on the Russian bank of the Amur. Across the river: the Chinese city of Heihe.

Credit: Dimitar Dilkoff/AFP via Getty Images

The Hu Line is arguably the most consequential feature of China's geography, with demographic, economic, cultural, and political implications for the country's past, present, and future. Yet you won't find it on any official map of China, nor on the actual terrain of the People's Republic itself.

There are no monuments at its endpoints: not in Heihe in the north, just an icy swim across the Amur from Blagoveshchensk, in Russia's Far East; nor in Tengchong, the subtropical southern city set among the hills rolling into Myanmar. Nor indeed anywhere on the 2,330-mile (3,750-km) diagonal that connects both dots. The Hu Line is as invisible as it is imaginary.

Yet the point that the Hu Line makes is as relevant as when it was first imagined. Back in 1935, a Chinese demographer called Hu Huanyong used a hand-drawn map of the line to illustrate his article on 'The Distribution of China's Population' in the Chinese Journal of Geography.

The point of the article, and of the map: China's population is distributed unevenly, and not just a little, but a lot. Like, a lot.

  • The area to the west of the line comprised 64 percent of China's territory but contained only 4 percent of the country's population.
  • Inversely, 96 percent of the Chinese lived east of the 'geo-demographic demarcation line', as Hu called it, on just 36 percent of the land.

Much has changed in China in the intervening near-century. The weak post-imperial republic is now a highly centralized world power. Its population has nearly tripled, from around 500 million to almost 1.4 billion. But the fundamentals of the imbalance have remained virtually the same.

Even if China's territory has not: in 1946, China recognized the independence of Mongolia, shrinking the area west of the Hu Line. Still, in 2015, the distribution was as follows:

  • West of the line, 6 percent of the population on 57 percent of the territory (average population density: 39.6 inhabitants per square mile (15.3/km2).
  • East of the line, 94 percent of the population on 43 percent of the territory (average population density: 815.3 inhabitants per square mile (314.8/km2).

Persistent dichotomy

Hu Huanyong's original hand-drawn map of China, showing population density and the now-famous line (enhanced for visibility).

Credit: Chinese Journal of Geography (1935) – public domain.

Why is this demographic dichotomy so persistent? In two words: climate and terrain. East of the line, the land is flatter and wetter, meaning it's easier to farm, hence easier to produce enough food for an ever-larger population. West of the line: deserts, mountains, and plateaus. Much harsher terrain with a drier climate to boot, making it much harder to sustain large amounts of people.

And where the people are, all the rest follows. East of the line is virtually all of China's infrastructure and economy. At night, satellites see the area to the east twinkle with lantern-like strings of light, while the west is a blanket of near total darkness, only occasionally pierced by signs of life. In China's 'Wild West', per-capita GDP is 15 percent lower on average than in the industrious east.

An additional factor typifies China's population divide: while the country overall is ethnically very homogenous – 92 percent are Han Chinese – most of the 8 percent that make up China's ethnic minorities live west of the line. This is notably the case in Tibet and Xinjiang, two nominally autonomous regions with non-Han ethnic majorities.

This combination of economic and ethnic imbalances means the Hu Line is not just a persistent quirk, but a potential problem – at least from Beijing's perspective. Culturally and geographically distant from the country's east, Tibetans and Uyghurs have registered strong opposition to China's centralizing tendencies, often resulting in heavy-handed repression.

Long-term strategy

TENGCHONG COUNTY, CHINA - MARCH 12: (CHINA OUT) A woman knits a sweater aside a street at Heshun Township on March 12, 2006 in Tengchong County of Yunnan Province, China. Heshun, the remote town on China's southern border, once had very close contacts with the outside world. Since ancient times, it has been a trade center due to neighboring Myanmar famous for jade. As many overseas Chinese ancestors lived in 600-year-old Heshun, almost every resident in the town has friends and relatives abroad. (Photo by China Photos/Getty Images)

Street view in Tengchong, on China's border with Myanmar.

Credit: China Photos/Getty Images

But repression is not the central government's long-term strategy. Its plan is to pacify by progress. China's 'Manifest Destiny' has a name. In 1999, Jiang Zemin, then Secretary-General of the Chinese Communist Party, launched the 'Develop the West' campaign. The idea behind the slogan retains its political currency. In the last decade, Chinese Premier Li Keqiang has repeatedly urged the country to "break through" the Hu Line, in order to modernize China's western half.

The development strategy has an economic angle – adding industry and infrastructure to raise the region's per-capita GDP to the nation's average. But the locals fear that progress will bring population change: an influx of enough internal migrants from the east to tip the local ethnic balance to their disadvantage.

China's ethnic minorities are officially recognized and enjoy certain rights; however, if they become minorities in their own regions, those will mean little more than the right to perform folklore songs and dances. The Soviets were past masters in this technique.

Will China follow the same path? That question will be answered if and when the Hu Line fades from relevance, by how much of the west's ethnic diversity will have been sacrificed for economic progress.

Strange Maps #1071

Got a strange map? Let me know at strangemaps@gmail.com.

Weird science shows unseemly way beetles escape after being eaten

Certain water beetles can escape from frogs after being consumed.

R. attenuata escaping from a black-spotted pond frog.

Surprising Science
  • A Japanese scientist shows that some beetles can wiggle out of frog's butts after being eaten whole.
  • The research suggests the beetle can get out in as little as 7 minutes.
  • Most of the beetles swallowed in the experiment survived with no complications after being excreted.
Keep reading Show less

We're creating pigs with human immune systems to study illness

Are "humanized" pigs the future of medical research?

Surprising Science

The U.S. Food and Drug Administration requires all new medicines to be tested in animals before use in people. Pigs make better medical research subjects than mice, because they are closer to humans in size, physiology and genetic makeup.

Keep reading Show less

A new warning to sign to predict volcanic eruptions?

Satellite imagery can help better predict volcanic eruptions by monitoring changes in surface temperature near volcanoes.

Volcano erupting lava, volcanic sky active rock night Ecuador landscape

Credit: Ammit via Adobe Stock
Surprising Science
  • A recent study used data collected by NASA satellites to conduct a statistical analysis of surface temperatures near volcanoes that erupted from 2002 to 2019.
  • The results showed that surface temperatures near volcanoes gradually increased in the months and years prior to eruptions.
  • The method was able to detect potential eruptions that were not anticipated by other volcano monitoring methods, such as eruptions in Japan in 2014 and Chile in 2015.
Keep reading Show less
Politics & Current Affairs

Moral and economic lessons from Mario Kart

The design of a classic video game yields insights on how to address global poverty.

Quantcast