The Mousa Ali Volcano is a 2,021 metres (6,631 ft) stratovolcano located on the tri-point borders of Ethiopia, Eritrea and Djibouti. The volcano is the highest point in Djibouti. The volcano's summit is truncated by a caldera, which contains rhyolitic lava domes and lava flows. The last known eruption occurred before the Holocene era.Mousa Ali is situated at the tri-point of the Tadjourah Region of Djibouti; the Southern Red Sea Region of Eritrea; and the Afar Region of Ethiopia.