Mount Sinabung, Stratovolcano in North Sumatra, Indonesia

Mount Sinabung is a stratovolcano in North Sumatra, Indonesia, rising 2,460 meters above sea level and composed of alternating layers of andesite lava, ash, and volcanic debris. Its steep flanks carry barren patches where fresh deposits have replaced older vegetated zones, and its summit crater often shows fumaroles and plumes of smoke.

The volcano remained inactive for 400 years until it erupted in 2010, forcing tens of thousands of people to flee. Eruptions continued with varying intensity, shaping life in the region ever since through repeated evacuations and ash falls.

Karo communities have grown coffee, vegetables, and rice in the mineral-rich soils near the base for generations. Their villages carry names that reflect the mountain's power, and many residents return to their homes despite repeated eruptions.

The nearest towns are Kabanjahe and Berastagi, and the volcano lies about 40 kilometres from Lake Toba. Ash from Sinabung has fallen as far as Medan, 80 kilometres east, and flights at Medan's Polonia airport were reported unaffected during the 2010 eruptions. Check activity reports before travelling; the summit crater has four vents, one active.

Pyroclastic flows at Sinabung can reach speeds exceeding 700 kilometers per hour (435 miles per hour) and blanket entire slopes in seconds. These glowing avalanches of gas, ash, and rock account for much of the danger zone around the crater.