Peninsula, eastern Russia.
It lies between the Sea of Okhotsk on the west and the Pacific Ocean and Bering Sea on the east. It is 750 mi (1,200 km) long and 300 mi (480 km) across at its widest point, and it has an area of 140,000 sq mi (370,000 sq km). Mountain ranges extend along it; of its 127 volcanoes, 22 are active, including Klyuchevskaya Volcano (15,584 ft [4,750 m]), the highest peak in Siberia .