Bolshevik – the southernmost and second largest island in the Severnaya Zemlya Archipelago. It is washed by the waters of the Kara Sea and the Laptev Sea, part of the Krasnoyarsk Krai, Russia, and is separated from the mainland (Cape Chelyuskin) by Vilkitsky Strait, from other islands of the archipelago – by Shokalskiy Strait. The area is about 11.5 thousand km2. In the middle of the island, the relief is flattened and dome shaped, reaching the height of 600 m; about 30 % of the land is covered with glaciers and presents an arctic wilderness. Close to the eastern shore of the island there lie several small islands. B. was discovered in 1913 and thoroughly studied by the Soviet Polar Expedition of G.A. Ushakov and N.N. Urvantsev in 1931–1932.