Nubian Sandstone Aquifer System

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What Wikipedia says

The Nubian Sandstone Aquifer System (NSAS) is the world's largest known fossil water aquifer system. It is located underground in the eastern end of the Sahara desert and spans the political boundaries of four countries in northeastern Africa.

Excerpt from the Wikipedia article “Nubian Sandstone Aquifer System”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Miguelferig, CC0, via Wikimedia Commons.