Ol Doinyo Lengai is part of the Gregory Rift, which is part of the active East African Rift. Their occurrence may have been influenced by regional fault systems. There are deposits of past debris avalanches around the volcano, especially on its northern flank one such event has left a scar on the volcano's flanks. There are parasitic vents on Ol Doinyo Lengai's flanks, such as Kirurum Crater on the western, the Nasira cones on the northern, Dorobo crater on the northeastern and Oltatwa Crater on the eastern flank. White volcanic ash deposits cover the slopes of the volcano, which have large fractures on the western flank. The southern crater is inactive and sometimes filled with water. Small cones with sizes ranging from 2 metres (6 ft 7 in) to over 10 metres (33 ft) occur in the crater and produce lava flows from their summits and, when they collapse, from their flanks. The floor of the northern crater is covered with lava flows that resemble pahoehoe lavas. It has two craters on either side of the mountain summit, which is formed by a 110 metres (360 ft) high ridge. Ol Doinyo Lengai is a symmetric cone that rises more than 1,800 metres (5,900 ft) above the surrounding rift valley. As of 2012 about 300,000 people live in the region, and livestock farming is the most important economic activity although tourism is increasingly important. The summit was first explored between 19. Ol Doinyo Lengai lies in Tanzania, 16 kilometres (9.9 mi) south of Lake Natron and 120 kilometres (75 mi) northwest of Arusha. Other names are Basanjo, Donjo Ngai, Duenjo Ngai, Mongogogura, Mungogo wa Bogwe and Oldonyo L'Engai. 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 hunter with an arrow. Recent eruptions in 2007-2008 impacted the surrounding region. Uniquely for volcanoes on Earth, it has erupted natrocarbonatite, an unusual, cold and highly fluid type of magma. It consists of a volcanic cone with two craters, the northern of which has erupted during historical time. Ol Doinyo Lengai is an active volcano in Tanzania.
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