(奥卡万戈河)[1]是一个很好的例子。它流入三角洲沼泽中间的喀拉哈里沙漠:!(这里输入图像描述)(https://upload.wikimedia.org/wikipedia/commons/thumb/7/74/A_view_down_into_the_Okavango_Delta.jpg/640px-A_view_down_into_the_Okavango_Delta.jpg)奥卡万戈三角洲(CC)[2]贾斯汀大厅。[1]https://en.wikipedia.org/wiki/Okavango_River [2]: https://creativecommons.org/licenses/by/2.0/deed.en