China is very large and has a double nature, namely the Eastern and the Western parts. The division can be compared to the convection rolls, taking tectonic drift direction into account. The intersection between two circular zones divides China into two totally different parts. The border between China and India/Nepal is shaped exactly like the coastline of China. The amazing result is that most of Chinese territory is found within two circular effect zones with exactly the same radius, intersecting each other.
中国领土主要分两部分，东部和西部。这两个地区可以用两个圆圈来画出来，而东部圆圈的直径位于北纬32°。显出东部和西部两个圆圈直径是一样的。中国东部的北方和南方也可以这样分明，因为长江也接壤北纬32°。
To fully understand this you must take all the Eurasian Plate into account.
Resulting in this simple drawing:
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Magic Magma 