The Guelta d'Archei is one of the most famous guelta in the Sahara. The Guelta d'Archei is inhabited by several kinds of animals, most notably the West African crocodile.
Aloba Arch is a natural arch located in Chad, specifically on the Ennedi Plateau within the Sahara Desert in the northeast part of the country near Libya and Sudan. The arch is considered to be the 8th longest known natural arch, with a span of approximately 250 feet (76.2 m) and a height of 394 feet (120.1 m), making it one of the tallest known arches in the world.