Tarso Yega Mountain

Tarso Yega is a stratovolcano in Tibesti with a peak caldera that is 19 by 20 kilometers (12 by 12 miles) broad and 300 metres (980 feet) deep. The volcano's summit rises to a height of 2,972 meters (9,751 feet), and its caldera is the Tibesti's largest. Doudriki to the east, Ehi Dosoatou to the south, and Ehi Fodoboro to the southwest are nearby volcanoes. The Enneri Yega river drains the caldera westward and then southward before joining the Enneri Debarsar; the rivers once reached Lake Chad (Holocene).

The eruption of the volcano is marked by the emission of tephra, with the downsagging of the caldera floor causing a depression. Basaltic vents and lava domes were formed within this crater, and an intrusion known as Ehi Yodé formed 3 kilometers (1.9 miles) to the south.

The caldera has been badly eroded, with practically the whole southern side swept away, and the younger Voon ignimbrite has been emplaced within it; it belongs to a distinct volcano, Tarso Voon. The caldera has been exploited for irrigated agriculture by humans.

Location: Chad

Elevation: 2,972 m (9,751 ft)