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 in 1732. The Great Northern Expedition, which lasted from 1733 to 1743, was one of the largest exploration enterprises in history, organized and led by Vitus Bering, Aleksei Chirikov and a number of other major explorers. A party of the expedition personally led by Bering and Chirikov discovered southern Alaska, the Aleutian Islands and the Commander Islands, while the parties led by Stepan Malygin, Dmitry Ovtsyn, Fyodor Minin, Semyon Chelyuskin, Vasily Pronchischev, Khariton Laptev and Dmitry Laptev mapped most of the Arctic coastline of Russia (from the White Sea in Europe to the mouth of Kolyma River in Asia). The