The Fedchenko Glacier (RussianФедченко) is a large glacier in the Pamir Mountains of north-central Gorno-Badakhshan province, Tajikistan. The glacier is long and narrow, currently extending for and covering over . It is the longest glacier in the world outside of the polar regions. In the Karakoram Mountains, Siachen Glacier is 70 km long, Biafo Glacier is 63 km long, and Baltura and Baltoro are 57 km long. The Bruggen or Pio XI Glacier in southern Chile is 64 km long. Kyrgyzstan's South Inylchek Glacier is 62 km in length. Measurements are from recent imagery, generally with Russian 1:200,000 scale topographic mapping for reference as well as the 1990 Orographic Sketch Map: Karakoram: Sheets 1 and 2, Swiss Foundation for Alpine Research, Zurich. The maximum thickness of the glacier is , and the volume of the Fedchenko and its dozens of tributaries is estimated at —about a third the volume of Lake Erie.