The Cordillera Raura, also part of the Cordillera Occidental, lies between lat 10°21' and 10°31'S. and long 76°41' and 76°50'W. It trends northwesterly and is about 20 km long (fig. 2, table 1). The glacierized area is 57.03 km2, and the glaciers are classified chiefly as mountain glaciers. The highest peak, Cerro Santa Rosa, rises to 5,727 m asl. The area drains into the Pacific Ocean by Río Pativilca and Río Huaura and into the Atlantic Ocean by Río Marañón and Río Huallaga.