Volcanic Fields and Mountains in Libya and Chad20.7N 18.0E
The dark areas in this image of the Sahara Desert covering parts of Libya (above) and Chad (below) are volcanic fields and volcanic mountain ranges. Visible in the upper left quadrant is the Haruj, a large volcanic field spread across 45,000 km2 (17,000 sq mi) in central Libya.
The more triangular brown area to the south is the Tibesti Mountains, a range of inactive volcanoes located on the northern edge of the Chad Basin in the Borkou and Tibesti Region of northern Chad. The massif is one of the most prominent features of the Central-Sahara desert and covers an area of approximately 100,000 km². The northern slopes extend into southern Libya.