mount sibayak north sumatra indonesia

navigate by keyword : acidic activity around berastagi climbing crater crystalline discolouration eruption gases geothermal gunung high hiker hiking hot indonesia indonesian lake mount mountain nature north outdors seepage sibayak springs steam stratovolcano sulfur sulfurous sumatra travel traveler vents volcano

Mt. Sibayak Indonesian: Gunung Sibayak is a small 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.