Gasherbrum I, surveyed as K5 and also known as Hidden Peak, is the 11th highest mountain in the world at 8,080 metres (26,510 ft) above sea level. It is located between Shigar District in the Gilgit–Baltistan region of Pakistan and Tashkurgan in the Xinjiang of China. Gasherbrum I is part of the Gasherbrum Massif, located in the Karakoram region of the Himalaya. Gasherbrum is often claimed to mean "Shining Wall", presumably a reference to the highly visible face of the neighboring peak Gasherbrum IV; but in fact, it comes from "rgasha" (beautiful) + "brum" (mountain) in Balti, hence it actually means "beautiful mountain."

Gilgit-Baltistan, formerly known as the Northern Areas, is a region administered by Pakistan as an administrative territory and consists of the northern portion of the larger Kashmir region, which has been the subject of a dispute between India and Pakistan since 1947 and between India and China since 1959. It borders Azad Kashmir to the south, the province of Khyber Pakhtunkhwa to the west, the Wakhan Corridor of Afghanistan to the north, the Xinjiang region of China to the east and northeast, and the Indian-administered union territories of Jammu and Kashmir and Ladakh to the southeast.