Check out the amazing rock formations on display in this Overview of Chad’s Borkou Region. Covering more than 93,000 square miles (240,000 square km) in the Sahara Desert, Borkou is the largest region in the country but houses less than 1% of its population — just 97,251 people. In the top left of this Overview is Emi Koussi, a pyroclastic shield volcano and the highest point in Chad at 11,204 feet (3,415 meters).