K12 is the second highest peak in the Saltoro Mountains, a subrange of the Karakoram range in the Siachen region in Azad Kashmir, Pakistan. It lies near the Line of Control between the areas controlled by India and Pakistan. Its name comes from its designation given during the original survey of the Karakoram range. K12 lies to the southwest of the Siachen Glacier; the K12 glacier heads on its northeast slopes and feeds the Siachen. The western slopes of K12 drain to the Bilafond Glacier system, and thence to the Dansam River, and eventually the Indus River. K12 had been used as the objective for training Indian Army Mount Everest expedition in 1985.
Apart from this, K12 has seen little climbing activity, partly because of the unsettled political situation and the continued military presence in the area. It was first attempted in 1960, after a reconnaissance visit by famed explorer Eric Shipton in 1957.