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.
Seulawah Agam is an extensive forested volcano located at the northwestern tip of Sumatra. Several names have been given to the mountain: Seulawaih Agam, Seulawain Agam, Solawa Agam, Solawaik Agam, Selawadjanten and Goldberg.
The volcano was constructed during the Pleistocene-Holocene age. The mountain has a large caldera, called Lam Teuba. A smaller eight by six kilometer caldera is within the Lam Teuba caldera. The volcano contains several hills: sedimentary hills, old volcano hills, a volcanic cone and peneplain area. The volcanic cone was formed by lava and pyroclastic flows. There are three craters. The Tanah Cempago crater is easily recognized, while the other two are covered with vegetations.
