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.
Mount Tongkoko or Mount Tangkoko is a stratovolcano in the north of Sulawesi, Indonesia. Its summit has an elongated deep crater. On the east flank there is a flat lava dome Batu Angus. Historical records only show eruptions in the nineteenth century.