Namibia, officially the Republic of Namibia (Afrikaans Republiek van Namibië, German: Republik Namibia), is a country in Southern Africa whose western border is the Atlantic Ocean. It shares land borders with Angola and Zambia to the north, Botswana and Zimbabwe to the east, and South Africa to the south and east. It gained independence from South Africa on 21 March 1990 following the Namibian War of Independence. Its capital and largest city is Windhoek (German: Windhuk). Namibia is a member state of the United Nations (UN), the Southern African Development Community (SADC), the African Union (AU), the Commonwealth of Nations and many other international organisations. It has been given many names: the land of contrasts, the land God made in anger, the ageless land. For many years it was known only as South West Africa, but it adopted the name Namibia, after the Namib Desert. It is the second least densely populated country in the world, after Mongolia.