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Okavango Delta

geography Maturity 11-13 Next article →

The Okavango Delta is a massive inland delta located in Botswana. It sits within the central part of the Kalahari Desert. Most river systems eventually flow into a sea or an ocean. However, the Okavango is an endorheic basin. This means the water does not reach the sea. Instead, the water reaches a tectonic trough. The water eventually disappears through evaporation and transpiration.

DeltaOkawango
DeltaOkawango

This unique wetland is a UNESCO World Heritage Site. It was also named one of the Seven Natural Wonders of Africa in 2013.

The delta functions through a cycle of seasonal flooding. The process begins in the Angola highlands. Heavy summer rains fall there during January and February. This water flows into the Okavango River. The surge travels toward the delta over about one month. The water then spreads across the landscape from March to June. High temperatures cause rapid evaporation and transpiration. This creates three distinct cycles of rising and falling water levels.

Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32
Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32

Flood peaks occur between June and August. This happens during the dry winter months in Botswana. During this time, the delta swells to three times its permanent size. The land is extremely flat with very little height variation. The water level drops about 90 meters from Mohembo to Maun. This massive influx of water creates a huge concentration of wildlife.

Okavango Delta
Okavango Delta

This seasonal change is vital for the ecosystem's survival.

The geography of the delta includes many unique islands. About 70% of these islands began as termite mounds. Trees take root on these mounds of soil to grow. Some islands contain barren white patches in their centers. This happens because salt accumulates around plant roots. These areas become too salty for most plants. Only occasional salt-resistant palm trees can grow there. Chief's Island is the largest island in the delta. A fault line uplifted this area over several millennia.

Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32
Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32

Wildlife thrives in this environment due to the water. The delta is home to the "big five" animals. These include lions, leopards, African buffalo, elephants, and rhinoceroses. The lechwe is the most abundant large mammal. There are approximately 88,000 lechwe in the area.

Antílopes lechwes (Kobus leche), vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 27
Antílopes lechwes (Kobus leche), vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 27

You can also find cheetahs and African wild dogs. The delta hosts over 400 bird species. These include the African fish eagle and the marabou stork.

Cheetah at Sunset
Cheetah at Sunset

There are also 71 different fish species living in the water.

Plants are essential for shaping the physical delta. The river carries a heavy load of sand. Because the water is clean, there is very little mud. Plants act like glue to hold the sand together. This process creates new islands over time. As plants capture sand, the river banks build up. This can cause the river to change its course. Old river channels become blocked by plant growth. These old banks then become linear islands.

Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32
Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32

Human groups have lived near the delta for a long time. The Hambukushu, Dceriku, Wayeyi, Bugakhwe, and Gxanekwe are local ethnic groups. Some people use makoros to navigate the water.

Travesía del delta del Okavango en makoro, Botsuana, 2018-08-01, DD 22
Travesía del delta del Okavango en makoro, Botsuana, 2018-08-01, DD 22

Farmers use the moisture left in the soil after floods. They call these areas molapo. They grow crops using this residual moisture. To manage this, people built bunds with sluice gates. These structures help control flooding for recession cropping.

BundPhoto
BundPhoto

This allows for more stable food production in the region.

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🖼️ Images & Media (7)
File:DeltaOkawango.jpg
DeltaOkawango.jpg
File:Vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 32.jpg
Vista aérea del delta del Okavango,...
File:Okavango Delta.jpg
Okavango Delta.jpg
File:Cheetah at Sunset.jpg
Cheetah at Sunset.jpg
File:Antílopes lechwes (Kobus leche), vista aérea del delta del Okavango, Botsuana, 2018-08-01, DD 27.jpg
Antílopes lechwes (Kobus leche), vista...
File:Travesía del delta del Okavango en makoro, Botsuana, 2018-08-01, DD 22.jpg
Travesía del delta del Okavango en...
File:BundPhoto.JPG
BundPhoto.JPG
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