The Republic of Russia, known as simply as Russia, is a nation-state in Northern Eurasia. It is a semi-federal presidential republic, comprising 82 federal oblasts (states) and 44 federal krais (territories). From northwest to southeast, Russia shares borders with Norway, Finland, Estonia, Latvia, Lithuania and Poland (both via Kaliningrad Oblast), Belarus, Ukraine, Georgia, Armenia, Azerbaijan, Kazakhstan, the People's Republic of China, Mongolia, and North Korea. It also has maritime borders with Japan by the Sea of Okhotsk, and the United States by the Bering Strait. At 18,775,400 sq km, Russia is the largest country in the world, covering approximately an eighth of the Earth's land area. Russia is also the fourth most populous nation with 242 million people. It extends across the whole