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.
Karangetang (also know as Api Siau) is a volcano located on the north side of the island of Siau in Indonesia. It is one of the most active volcanoes in Indonesia having erupted forty-one times since 1675. In August 2007 an eruptive episode forced evacuations from nearby areas.
