Tibet (Tibet Autonomous Region, TAR for short) borders Xinjiang, Qinghai, Sichuan and Yunnan internally while India, Burma, Bhutan, Sikkim, and Nepal meet its external borders. It covers a massive 1,220,000 square kilometers (470,920 square miles), which is about 12.8 % of the whole of China. With an average height of 4,000 meters above sea level, Tibet is encompassed by some of the world's highest mountains. The Himalayas to the south, the Karakoram to the west, and the Kunlun to the north are the dream lands of all adventurers and mountaineers.