Situated on the southern Atlantic coast of Africa, Namibia is 3 times the size of the United Kingdom, with a population of fewer than 2 million people. Much of the country is arid, including the Namib Desert which extends along the country's desolate Atlantic shore, the northern part of which is the famous 'Skeleton Coast'. In the vicinity of Sossusvlei, towering orange sand dunes are a striking feature of the Namib. In spite of the general aridity, elephant, oryx and lion can be found in the desert regions and the coastal strip has flamingo and seal colonies. Inland is the Central Plateau, whilst to the east and north-east, adjacent to the borders with South Africa and Botswana is the Kalahari Desert, ancestral home of the San or 'Bushman' people. Rarely undertaken, the 3-day trek to the top of the country's highest peak, Brandberg (2573m / 8442ft) is an undoubted highlight. Namibia's most dramatic wildlife spectacle is found in the north, at world-famous Etosha National Park, where underground springs feed waterholes and nourish savannah grassland that sustains 110 species of mammals.