44：Muztagh Tower, 45：Diran, 46：Apsarasas Kangri I, 47：Rimo III, 48：Gasherbrum V Masherbrum (Urdu: مشہ بروم ; formerly known as K1) is a mountain located in the Ghanche District in the Gilgit Baltistan region of Pakistan.

It holds the distinction of being the first mapped peak in the Karakoram mountain range during the Great Trigonometrical Survey, leading to its K-number designation as "K1".

The attempt failed just short of the summit, when J.B. Harrison and R.A. Hodgkin, severely frostbitten, had to return due to bad weather.

[13] Masherbrum was first climbed in 1960 by George Irving Bell and Willi Unsoeld, led by the former, in an American-Pakistani expedition including Nick Clinch.

In her book, Voyage au Bout du Vide: Une Cordėe Alpine au Masherbrum,[15] the French mountaineer Christine de Colombel [fr] provides a dramatic account of her 1980 attempt, with David Belden, to ascend Masherbrum in alpine style.

Their three-month expedition, bedeviled by bad weather, ended in failure when avalanches swept their camp and injured de Colombel, leading to a desperate three-day retreat in whiteout conditions.