This is where I'm going.

TianZhu is significant in that in the three counties of this is the one which is primarily Tibetan, as you can see in the attached photo. From what I was told TianZhu was the first primarily tibetan region, to accept that it wanted to be part of China. So depending on how you look at it, it's either the province which was first forced under chinese domination, or the first sign of a unified China in this part of the world.