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What is the relationship between the population distribution and geographical conditions in China?

Junior high school geography shows that Heihe (Heilongjiang) and Tengchong (Yunnan) share a 1 population line, and the population east of the population line accounts for 90% of the total population in China. Due to the harsh geographical environment in the western part of the population line, there are Qinghai-Tibet Plateau, Yunnan-Guizhou Plateau, desert, etc., with a vast territory and few people, and many rivers in the east and coastal areas, which are suitable for human reproduction.