Russia, officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects. From northwest to southeast, Russia shares borders with Norway, Finland, Estonia, Latvia, Lithuania and Poland (both via Kaliningrad Oblast), Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, 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 17,075,400 square kilometres (6,592,800 sq mi), Russia is the largest country in the world, covering more than one eighth of the Earth's inhabited land area. Russia is also the eighth most populous nation with 143 million people. It extends across the whole of northern Asia and 40% of Europe, spanning nine time zones and incorporating a wide range of environments and landforms. Russia has the world's largest reserves of mineral and energy resources and is the largest oil producer and second largest natural gas producer globally. Russia has the world's largest forest reserves and its lakes contain approximately one-quarter of the world's fresh water.