Angola is situated on the Western coast of Southern Africa at the geographic co-ordinates of 12 30 S, 18 30 E and was a Portuguese colony until 11 November 1975, when acquired its independence. It has an area of 1,246,700 Sq Kilometers and it shares its borders of 4,837 km with the Republic of Congo (Brazzaville) and the Democratic Republic of the Congo (ex-Zaire) in the North, Zambia to the East and Namibia in the South. The West is washed by the Atlantic Ocean and this coastline is 1,650 kilometers long. The highest peak is Monte Moco (2,620 meters), situated in Huambo and the rivers Kwanza, Zaire, and Cunene, Cubango e Bengo, cross Angola.