Mount Sibayak () is a stratovolcano overlooking the town of Berastagi in northern Sumatra, Indonesia. Although its last eruption was more than a century ago, geothermal activity in the form of steam vents and hot springs remains high on and around the volcano. The vents produce crystalline sulfur, which was mined on a small scale in the past. Seepage of sulfurous gases has also caused acidic discolouration of the small crater lake.

Sibayak is a term from the Karo Batak language referring to a founding community. Mount Sibayak is relatively easy to climb and has been a tourist attraction since colonial times.

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File:Gunung Sibayak 2015-05-24.jpeg|Crater of Gunung Sibayak. Mount Sinabung in the back.

File:COLLECTIE TROPENMUSEUM Grand Hotel Brastagi aan de voet van de vulkaan Sibayak TMnr 60021770.jpg|Mount Sibayak in the 1920s

File:COLLECTIE TROPENMUSEUM De Sibajak raja berampat - de zogenaamde viervorsten - met hun vrouwen Karolanden Noord-Sumatra TMnr 10005425.jpg|The "Sibajak raja berampat", the so-called four princes with their wives, Karolanden, North Sumatra (1914–1919)

</gallery>On July 11, 1979, a Fokker F28 operating under Garuda Indonesian Airways crashed into this mountain.

See also

  • List of volcanoes in Indonesia

References

  • Photos of gunung Sibayak and gunung Sinabung