Ambang is a complex of volcanoes at the western of the northern arm of Sulawesi

Sulawesi

Sulawesi is one of the four larger Sunda Islands of Indonesia and is situated between Borneo and the Maluku Islands. In Indonesia, only Sumatra, Borneo, and Papua are larger in territory, and only Java and Sumatra have larger Indonesian populations.- Etymology :The Portuguese were the first to...

 island, Indonesia. There are two lakes, lake Mo'oat and lake Tondok (Danau Mo'oat and danau Tondok), at an elevation of 750 m. The larger of the two lakes is Mo'oat. Both of them are side by side. The volcano contains several crater

Volcanic crater

A volcanic crater is a circular depression in the ground caused by volcanic activity. It is typically a basin, circular in form within which occurs a vent from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of great depth...

s up to 400 m in diameter and five solfatara fields. The only historical account of its eruption occurred somewhere in 1850s.