Nigeria is a patchwork of distinctive regions, including deserts, plains, swamps, mountains, and steamy jungles. It has one of the largest river systems in the world, including the Niger Delta, the third largest delta on Earth.
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Background Okavango Delta. The Okavango River, with its length of 1,600 km, is the fourth longest river in Southern Africa and drains onto surface of the Kalahira Desert to create the world famous Okavango Delta, which has no outlet to the sea.