The Cordillera Huayhuash, between lat 10°11' and 10°26'S. and long 76°50' and 77°00'W., is part of the Cordillera Occidental of Perú. It is about 26 km long, and the glacierized area is 88.11 km². The highest peak is Cerro Yerupaja at an elevation of 6,634 m asl. Most of the glaciers are of the mountain type and drain into the Pacific and Atlantic Oceans by Río Pativilca and Río Marañón, respectively.