Strategy Page has a short primer on the potentially volatile issue of where the borders are in the Himalayas:
China is causing considerable consternation in India by reviving old claims to border areas. In northeast India, the state of Arunachal Pradesh has long been claimed as part of Tibet (although when Tibet was an independent nation a century ago, it agreed that Arunachal Pradesh was part of India.) Arunachal Pradesh has a population of about a million people, spread among 84,000 square kilometers of mountains and valleys. The Himalayan mountains, the tallest in the world, are the northern border of Arunachal Pradesh, and serve as the border, even if currently disputed, with China. This is a really remote part of the world, and neither China nor India want to go to war over the place. But the two countries did fight a short war, up in these mountains, in 1962. The Indians lost, and are determined not to lose if there is a rematch.
