A rare aerial view of the volcanic peaks the Hoggar Mountains in the Algerian Sahara 📸 by @geosteinmetz The Hoggar are about two billion years old. The three great mountain ranges in the Sahara are still home to remnants of a savannah ecosystem that flourished here only a few thousand years ago. In some of their remotest areas, one can still find desert cheetah, gazelles, and even a few crocodiles.