Russian Arctic islands Russian Arctic islands The Russian Arctic islands are a number of islands groups and sole islands scattered around the Arctic Ocean. The islands are all situated within the Arctic Circle and are scattered through the marginal seas of the Arctic Ocean, namely, the Barents Sea, Kara Sea, Laptev Sea, East Siberian Sea, Chukchi Sea and Bering Sea. The area extends some from Karelia in the west to the Chukchi Peninsula in the east. The largest of the Arctic islands is Severny Island, with an area of about . It is Russia's second largest island next to Sakhalin Island, and the
Ocean area and volume – are defined in part by the continents, various archipelagos, and other criteria. Oceans are fringed by smaller, adjoining bodies of water such as seas, gulfs, bays, bights, and straits. The mid-ocean ridges of the world are connected and form a single global mid-oceanic ridge system that is part of every ocean and the longest mountain range in the world. The continuous mountain range is long (several times longer than the Andes, the longest continental mountain range). The total mass of the hydrosphere is about 1.4 quintillion metric tons ( long tons or short tons), which is