Arctic Ocean deepest point is Litke Deep in the Eurasian Basin, at . The two major basins are further subdivided by ridges into the Canada Basin (between Alaska/Canada and the Alpha Ridge), Makarov Basin (between the Alpha and Lomonosov Ridges), Amundsen Basin (between Lomonosov and Gakkel ridges), and Nansen Basin (between the Gakkel Ridge and the continental shelf that includes the Franz Josef Land). In large parts of the Arctic Ocean, the top layer (about ) is of lower salinity and lower temperature than the rest. It remains relatively stable, because the salinity effect on density is bigger than the temperature effect.
Nansen Island (Kara Sea) and some of its larger neighboring islands, such as Taymyra, Bonevi and Pilota Makhotkina, are deeply indented, with many crooked inlets. The sounds between this island and neighboring islands are also somewhat labyrinthic. Geologically all these coastal islands are a continuation of the Nordenskiöld Archipelago which lies further north. And sometimes Nansen Island is considered a part of it. Ostrov Vkhodnoy is a long islet located off Nansena's western end. The sea surrounding Nansen Island is covered with pack ice with some polynias during the long and bitter winters and there are many ice floes even in the summer. Nansen