Well it depends whose globe i look at doesn't it? One side says one thing the other says another.

The point i was making is that most of the lines on the map that we call borders are really arbitrary and the arguments why they should be one way and not the other depend on your point of view. And the border between India and China is especially dubious in legitimacy because it was drawn by the British, and at a time when one of these two countries didn't even exist/was a colony and the other was too weak to defend its sovereign interests and territory.

And i don't understand the point you're making about rivers.