The Okavango Delta is the largest inland delta in sub-saharan Africa after the inner delta of the Niger. It lies in a semi-arid area and every year 97% of the annual inflow of between 7,000 and 15,000 million cubic meters is lost to evapotranspiration and seepage. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.