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Mystery of the desert: The lost cities of the Nigerien Sahara

phys.org Mystery of the desert: The lost cities of the Nigerien Sahara

A long trek across the desert of northeastern Niger brings the visitor to one of the most astonishing and rewarding sights in the Sahel: fortified villages of salt and clay perched on rocks with the Saharan sands laying siege below.

Mystery of the desert: The lost cities of the Nigerien Sahara
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