Russia’s 19,913 km (12,373 mi) of land boundaries abut on more countries than those of any other nation. On the north it is bordered by a number of arms of the Arctic Ocean comprising, west to east: the Barents, Kara, Laptev, East Siberian, and Chukchi seas. On the east it is bordered by several arms of the Pacific Ocean, comprising, north to south: the Bering Strait, the Bering Sea, and the seas of Okhotsk and Japan (East Sea). In the extreme south-east, Russia borders the north-eastern tip of North Korea. On the south it is bordered, east to west, by China, Mongolia, Kazakhstan, the Caspian Sea, Azerbaijan, Georgia, and the Black Sea. On the south-west it is bordered by Ukraine, and on the west it is bordered, south to north, by Belarus, Latvia, Estonia, the Gulf of Finland, Finland, and Norway. The Kaliningrad oblast (formerly Königsberg in East Prussia) is separated from the rest of Russia by Belarus and Lithuania. It is bordered by the latter on the north and east, by Poland on the south, and the Baltic Sea on the west.