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.
Geureudong or Bur ni Geureudong or Bur ni Telong is a stratovolcanic complex in the northern of Sumatra, Indonesia. The official name of the whole complex is confusing between the two adjacent volcanoes: Bur ni Geureudong and Bur ni Telong. Two other volcanic cones are Salah Nama and Pepanji, and there are small sediment hills. Bur ni Geureudong has been eroded since the Pleistocene age, but has solfatara and hot springs on its flanks. Bur ni Telong is located in the south of Bur ni Geureudong. Bur ni Telong has active crater that lava flows are exposed in the southern flank.
