The highest point of the desert is the dormant Emi Koussi volcano with a height of 3,415 meters (11,204 feet).

The volcano is located in Chad, in the volcanic massif Tibesti, and has a diameter of about 65 kilometers.

The summit of the volcano is topped by a crater measuring 15 by 11 kilometers and 1,200 meters deep. NASA Earth Observatory / Public Domain

The last eruptions of Emi Koussi occurred between 2.4 and 1.3 million years ago.