K2 (also known as Savage Mountain, Mountaineer's Mountain, Mount Godwin-Austen, Balti: Chogori and Sarikoli: Mount Qogir) is the second-highest mountain on Earth, after Mount Everest. With a peak elevation of 8,611 m (28,251 feet), K2 is part of the Karakoram Range, and is located on the border between Baltistan, in the Gilgit–Baltistan region of Pakistan, and the Taxkorgan Tajik Autonomous County of Xinjiang, China. It is more hazardous to reach K2 from the Chinese side; thus, it is mostly climbed from the Pakistani side.
K2 is known as the Savage Mountain due to the difficulty of ascent and the second-highest fatality rate among the "eight thousanders" for those who climb it. For every four people who have reached the summit, one has died trying. Unlike Annapurna, the mountain with the highest fatality rate, K2 has never been climbed in winter.
The name K2 is derived from the notation used by the Great Trigonometric Survey. Thomas Montgomerie made the first survey of the Karakoram from Mount Haramukh, some 210 km (130 miles) to the south, and sketched the two most prominent peaks, labelling them K1 and K2.
Information based on http://en.wikipedia.org/wiki/K2