Dolok Sibualbuali

Dolok Sibualbuali is a stratovolcano in the Bukit Barisan mountain range rising to about 1,819 meters (5,967 feet). Its eastern flank contains two solfatara fields where steaming gas vents escape through cracks in the volcanic rock and feed small hot springs.

The volcano formed through tectonic interactions between the Eurasian and Indo-Australian plates, which created the entire Bukit Barisan mountain chain. This volcanic activity has shaped the region's geology over millions of years.

Local communities near the mountain use its geothermal springs and gas vents for traditional healing practices rooted in their customs. The natural hot water and steam features are woven into their daily routines and local beliefs.

Visitors must obtain permits from the Dolok Sibual-Buali Nature Reserve authorities and hire a local guide before attempting the climb. The mountain requires good fitness and proper equipment suitable for rough terrain and potential steam vents.

The sulfur fields on the eastern side continuously produce steam and sulfur odor, giving the landscape a surreal appearance. Visitors can observe gas vents in real time during clear weather, experiencing the mountain's geological activity up close.