Mount Sirung, Active volcano at Pantar Island, Indonesia.

Mount Sirung is an active volcano on Pantar Island rising to approximately 862 meters with a large crater lake and multiple steam vents visible at its summit. The crater floor displays intense volcanic activity through sulfur deposits and continuous gas emissions that alter the landscape.

The volcano experienced its most powerful eruption in 1970, affecting surrounding areas with lava and ash. Since 2004, scientists have documented continuous gas and ash emissions, confirming the mountain remains dynamically active.

The mountain's name is used locally as Gunung Sirung, and the nearest settlement is Kampung Kakamauta in Mauta village, Central Pantar district, Alor regency. Villagers live on the volcano's lower slopes and their fields and paths lie within the area that was evacuated within 1.5 km of the caldera after the 12 May 2012 eruption. The volcano is promoted as a hiking destination together with the crater lake, and the hot springs and waterfall of Pantar are marketed alongside it.

The hike begins from Kakamauta village following a marked trail to the summit, with elevation and volcanic gases presenting physical demands. Starting early provides daylight for descent and allows time to acclimatize to the air quality.

The crater basin contains numerous fumaroles releasing sulfurous gases through the lake surface, creating a surreal landscape of steam vents. These openings reveal the intense heat source beneath the mountain that feeds the hydrothermal activity.