Guelta d’Archei is an oasis of life located in the middle of the Sahara desert, in the Ennedi Plateau, in north-eastern Chad, hidden behind a canyon. Every day, this guelta – a type of wetland typical of desert regions that is formed when the underground water in lowland depressions spills to the surface and forms permanent pools and reservoirs- provides water for hundreds of camels. Because of the dung from thousands of camels excreted over hundreds of years, the water has turned black.
The camel droppings act like a fertilizer for the algae that is food for the fish, which are further ate by the crocodiles that survive near these waters. Thus, Guelta d’Archei is a zoological marvel.