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
Tethys Ocean Western Tethys Ocean, or Paratethys or Alpine Tethys Ocean. The Black, Caspian, and Aral seas are thought to be its crustal remains, though the Black Sea may, in fact, be a remnant of the older Paleo-Tethys Ocean. The Western Tethys was not simply a single open ocean. It covered many small plates, Cretaceous island arcs, and microcontinents. Many small oceanic basins (Valais Ocean, Piemont-Liguria Ocean, Meliata Ocean) were separated from each other by continental terranes on the Alboran, Iberian, and Apulian plates. The high sea level in the Mesozoic flooded most of these continental domains, forming shallow seas. As theories