Tarso Toon Mountain

Tarso Toon (sometimes spelled Tarso Toh; "Tarso" means "high plateau") is a volcano in the Tibesti Mountains' central region. The volcano has a maximum elevation of 2,575 meters (8,448 feet) and a breadth of 21 by 19 kilometers (13 km 12 mi), covering a surface area of 600 square kilometers (230 sq mi). It also has a caldera that is 11 by 12 kilometers (6.8 km 7.5 mi) broad, with a gap on the northern side.

It was active throughout the Miocene, forming over older ignimbrites with tholeiitic rocks. Later, felsic volcanic rocks were emplaced within the caldera, and parts of the tholeiite were buried by the Voon ignimbrite.

Begour crater is located on the mountain. It is around 800 metres (0.5 mi) broad and generally dry, with the exception of few tiny ponds and a ring of diatom- and mollusc-containing sediments that forms a ring terrace inside the crater. Radiocarbon dating of sediments at Begour has produced ages of 8,300 300 years ago, and Tarso Toh is thought to be a Holocene volcano.

Location: Chad

Elevation: 2,000 m (6,600 ft)