Page "Emi Koussi" Paragraph 1

Two nested calderas cap the volcano, the outer one being about 12 by 15 km in size.

Within it on the southeast side is a smaller caldera, about 2 – 3 km wide and 350 m deep.

Numerous lava domes, cinder cones, maars, and lava flows are found both within the calderas and along the outer flanks of the shield.

The inner caldera contains large natron deposits which see some harvesting for domestic animal salt lick use by the local people.