Namibia is largely an elevated, waterless plateau partly suitable for arid grazing. The average altitude is 1,080 m (3,543 ft) above sea level; the high point, near the coast, is Konigstein, at 2,606 m (8,550 ft). Along almost the entire range of the coast there are sandy wastes and high, reddish sand dunes. The coastal strip comprises the Namib Desert, and the eastern region is part of the Kalahari Desert. All four permanent rivers form borders: the Kunene and Okavango in the north, the Zambezi in the northeast, and the Orange (Oranje) in the south.