Tectonic aneurysms are found in areas with localized high relief of relatively young rocks when compared to their surroundings. Actively observed systems that have been studied the most are located in 2 main regions of the Himalaya, the Nanga Parbat-Haramosh Massif and Namche Barwa-Gyala Peri which occur on the Eastern and Western edges respectively. The Indus River is the mechanism responsible for crustal removal in the Nanga Parbat region, and the Tsangpo River is active in the Namche Barwa region.