East Siberia – a part of the Asian territory of Russia lying to the east of the Yenisei River as far as the ranges of the Pacific Ocean Drainage Divide and from the marginal seas of the Arctic Ocean to the state boarders of Russia with Mongolia and partially China. The area is 7.2 million km2. Most of it is occupied by the Central Siberian Plateau; in the north there is a lowland zone (North Siberian Lowland, Central Yakutsk Lowland, Yana-Indigirka Lowland), in the south the mountains of South Siberia, and in the east the Yana-Kolyma Plain. In the north E.S. is washed by the Kara Sea, the Laptev Sea, and the East Siberian Sea. The vast territory of E.S. possesses great natural resources.