The Okavango Delta in Botswana is the world's largest domestic delta region. The delta is fed by the rains that fall in the western highlands of Angola from April to October. The water then flows through Namibia to Botswana. At the height of Maun, a natural dam is formed by an upward shifted ground plate. The water cannot flow any further, and so it fans out into the Okavango Delta.
The Okavango Delta is a unique ecosystem of waterways and islands, which is surrounded by the Kalahari Desert. The water that the delta enters is unusually pure and a source of life for a large number of plants and animals that do not normally inhabit deserts. One may encounter elephants, hippos, crocodiles, zebras, buffaloes, lions, giraffes, leopards, hyenas and large numbers of birds.
During the peak season, the size of the delta expands to approximately 16,000 square kilometres (roughly half the size of Belgium). At low tide, the delta is still approximately 9,000 km2.