Several volcanoes existed on the floor of Lake Cahuilla and are now emergent at the southeastern margin of the Salton Sea, including the Cerro Prieto and the Salton Buttes. Cerro Prieto is formed by two c. high lava domes that coalesce into a volume of about and a wide crater on the northeastern dome. In addition, mud pots and mud volcanoes exist on the floor of the Cahuilla Basin. Geothermal energy is obtained in some parts of the region. The presence of volcanism may have been facilitated by extensional faults, which would have provided pathways for magma ascent.