The Fedchenko Glacier or the Vanch-Yakh Glacier is a large glacier in the Yazgulem Range, Pamir Mountains, of north-central Gorno-Badakhshan province, Tajikistan. The glacier is long and narrow, currently extending for 77 kilometres (48 mi) and covering over 700 square kilometres (270 sq mi). It is the longest glacier in the world outside of the polar regions. The maximum thickness of the glacier is 1,000 metres (3,300 ft), and the volume of the glacier and its dozens of tributaries is estimated at 144 cubic kilometres (35 cu mi)—about a third of the volume of Lake Erie.