The geography of Indonesia is dominated by volcanoes that are formed due to subduction zones between the Eurasian plate and the Indo-Australian plate. Some of the volcanoes are notable for their eruptions, for instance, Krakatau for its global effects in 1883, Lake Toba for its supervolcanic eruption estimated to have occurred 74,000 Before Present which was responsible for six years of volcanic winter, and Mount Tambora for the most violent eruption in recorded history in 1815.
Ambang is a complex of volcanoes at the western of the northern arm of Sulawesi island. There are two lakes, lake Mo'oat and lake Tondok (Danau Mo'oat and danau Tondok), at an elevation of 750 m. The biggest of the two lakes is Mo'oat. Both of them are side by side. The volcano contains several craters up to 400 m in diameter and five solfatara fields. The only historical account of its eruption occurred somewhere in 1850s.