It is the largest river in a landlocked country (like 15 others located on this continent)

It is the largest river in a landlocked country (like 15 others located on this continent). It does not flow anywhere, but, nevertheless, it has a well-defined delta. The delta area is more than 16 thousand square kilometers. What is the name of the river, country, continent, and for what reason does the river not flow anywhere?

This description applies to the Okavango River, which flows in southern Africa. This river covers the territory of three countries: Angola, Namibia and Botswana. At the same time, its source is located in Angola, then it flows along the Angolan-Namibian border, and its mouth unfolds on the territory of Botswana, where a huge delta with an area of about 16 thousand kilometers is formed. This is the largest delta that does not flow anywhere, because The Okavango does not belong to the basin of any body of water. At the place of the delta, its waters end due to evaporation and absorption by swamps.