Batang Toru basin

province of Indonesia

mountain range in Sumatra, Indonesia

regency in North Sumatra Province, Indonesia

regency in North Sumatra Province, Indonesia

regency in North Sumatra Province, Indonesia

regency in North Sumatra Province, Indonesia

Sipirok is a town in North Sumatra province of Indonesia and the seat (capital) of South Tapanuli Regency. It is known for the Batu Jomba Sipirok, a badly maintained highway which becomes difficult and dangerous during wet weather.

Sibualbuali is a stratovolcano in northern Sumatra, Indonesia. It has two solfatara fields on the eastern flank. There is a rhyolitic-dacitic lava dome, erupted from the Toru-Asik fault.

Lubukraya is an andesitic stratovolcano on Sumatra island, Indonesia. It has a broad crater breached to the south and a lava dome at the southern foot of the volcano.

river in North Sumatra, Indonesia

thumb|A flood of Silindoeng (Silindung Valley) plain at Taroetoeng (1917)