National Geographic Travelのインスタグラム(natgeotravel) - 9月4日 01時05分

Photo by George Steinmetz @geosteinmetz | The miraculous oasis of Ounianga Serir in the Central Sahara of Chad is fed fresh water by an ancient aquifer from a time when the Sahara was a savannah. The lakes have slightly different elevations, and the higher ones are less salty. Maps from aerial surveys in 1954 show the lakes being larger and more connected, indicating that the water level has dropped. Seen here is the lowest lake, which is punctuated by ship-like islands of Nubian sandstone that were used as refuges by the local Tubu in times of attack. To explore more of our world, follow @geosteinmetz.

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