Ol Doinyo Lengai is an active volcano in Tanzania. It consists of a volcanic cone with two craters, the northern of which has erupted during historical time. Uniquely for volcanoes on Earth, it has erupted natrocarbonatite, an unusual, cold and highly fluid type of magma. Recent eruptions in 2007-2008 impacted the surrounding region. Name The Maasai and Sonjo people refer to the volcano as "The Mountain of God", viewing it as the abode of the god Engai, who withdrew there after being hit by a hu…