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History: The Okavango Delta is a large low gradient alluvial fan or âInland Deltaâ located in north-western Botswana. The area includes permanent swamps which cover approximately 600,000 ha along with up to 1.2m ha of seasonally flooded grassland.
Traditionally, annual rainfall levels in the Okavango Delta average out at 450 mm, with the wet season beginning in December, peaking in January and February, and finishing by March.upplied by rains collected in the Angolan highlands, these begin in March, peak in mid-winter, and are lost to evapotranspiration by the end of the year. Averaging 11 billion litres per year, the annual floods almost double the deltaâs size, from 900 to 1600 km2.