The mountain of god, is an active volcano situated at the Southern end of the lake, rises to an elevation of 2.880 metres above the sea level. It is the only active volcano in Tanzania It is unique among active volcanoes in that, it produces natrocarbonatite lava. It has explosive eruptions every twenty to forty years. The last bigger eruption was in 1966, with some smaller ones in 1983, 1933 and 2007. Mount Lengai can be climbed up to the peak and sometimes also all the way down to the crater.