a mountain range in North America on the Alaskan peninsula. The eastern continuation of the Aleutian Island ridge, it is about 850 km long. It consists of a chain of young Neocene-Quaternary volcanic cones rising to an altitude of 2,500–3,000 m. The highest peak is Mount Redoubt at 3,108 m. There are ten active volcanoes, including the Iliamna, the Katmai, and the Pavlov. The range still bears traces of the ice age. The highest peaks are covered with permanent snow and small glaciers and the slopes with subarctic meadows and mountain tundra.