A river delta usually leads to the open sea.But in Botswana in southern Africa, the Okavango River empties into open land, creating the flooded habitat for an array of savannah wildlife.

• 三角洲通常面朝大海，但是在南非的博茨瓦纳，奥卡万高河注入开阔的内陆，为一系列的热带大草原野生动物提供了栖息地。