Geography of Russia , the Russian border is the world's longest. Along the 20,139-kilometer land frontier, Russia has boundaries with 14 countries: Norway, Finland, Estonia, Latvia, Lithuania, Poland (via the Kaliningrad Oblast), Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, Mongolia, the People's Republic of China and North Korea. Approximately two-thirds of the frontier is bounded by seawater. Virtually all of the lengthy northern coast is well above the Arctic Circle; except for the port of Murmansk—which receives currents that are somewhat warmer than would be expected at that latitude, due to the effects of the Gulf Stream—that coast is locked in ice much of the
Arctic policy of Russia of the Sea (UNCLOS), which allowed countries to make claims to extended continental shelves. In accordance with UNCLOS, Russia submitted a claim to an extended continental shelf beyond its 200-mile (320 km) exclusive economic zone on December 20, 2001, to the UN Commission on the Limits of the Continental Shelf (CLCS). Russia claimed that two underwater mountain chains - the Lomonosov and Mendeleev ridges - within the Russian sector of the Arctic were extensions of the Eurasian continent and thus part of the Russian continental shelf. The UN CLCS neither validated nor invalidated the claim but requested Russia to submit