Okavango Delta

The Okavango Delta lies in north-western Botswana, at the end of a river system whose basin extends across Angola, Namibia and Botswana. The Okavango is an inland, or endorheic, delta: rather than reaching the ocean, its water disperses across a low-gradient alluvial fan and into the Kalahari Basin. Its landscape is a mosaic of permanent swamps and marshes, channels, lakes, floodplains and grasslands that are inundated seasonally.

The river’s flow is transboundary. A Ramsar Convention case study reports that about 95 percent of the basin’s runoff is generated in Angola’s headwaters before flowing south through the Cubango and Cuito rivers and onward as the Okavango. UNESCO describes the delta as one of the few major inland delta systems that do not flow to a sea or ocean.

A defining feature of the delta is that its annual flooding occurs during Botswana’s local dry season. This timing reflects water arriving from rainfall in the distant upstream basin, rather than only from rain falling over the delta itself. The rising and receding waters continually connect and separate aquatic and terrestrial habitats, shaping the region’s ecological cycles.

The seasonal pulse supports varied habitats and wildlife; UNESCO identifies species including cheetahs, white and black rhinoceroses, African wild dogs and lions among the delta’s notable large mammals. Research on the floodplain also finds that fish communities and fisheries change with the extent and timing of floods. Fishing contributes to food and livelihoods for riparian communities, making the hydrological cycle important to both ecology and human use of the delta.

The Okavango Delta System was designated a Wetland of International Importance under the Ramsar Convention in 1996. UNESCO inscribed the delta as a natural World Heritage property in 2014; it was the 1,000th property added to the World Heritage List. The protected boundaries are not identical: the Ramsar site covers about 5.54 million hectares, while the World Heritage property covers about 2.02 million hectares.

Because much of the water originates outside Botswana, the delta’s condition depends on the wider river basin as well as local management. UNESCO has highlighted the importance of maintaining upstream environmental flows and coordinating across the countries that share the basin. The Ramsar case study also describes the role of local and Indigenous communities, whose traditional use of land and resources is part of the region’s human geography and conservation context.