Which African country was once a colony called 'German South-West Africa'?

German South West Africa (German: Deutsch-Südwestafrika, DSWA) was a colony of the German Empire from 1884 until 1915. With an area of 835,100 km², it was one and a half times the size of the mainland German Empire in Europe at the time. The colony had a population of around 2,600 Germans.

In 1915, during the First World War, German South West Africa was invaded by the Western Allies in the form of South African and British forces. After the war its administration was taken over by the Union of South Africa (part of the British Empire) and the territory was administered as South West Africa under a League of Nations mandate. It became independent as Namibia in 1990.

Many German names, buildings, and businesses still exist in the country, and about 30,000 people of German descent still live there. German is still widely used in Namibia, with the Namibian Broadcasting Corporation operating a German language radio station and broadcasting television news bulletins in German, while the daily newspaper Allgemeine Zeitung, founded in 1916, remains in publication. Deukom, a satellite television service, offers television and radio channels from Germany.