Colo

Colo is a stratovolcano on Una-Una Island in the Gulf of Tomini, rising roughly 500 meters above sea level. The mountain features a wide crater with a smaller volcanic cone inside, and forms the entirety of the island itself.

The volcano experienced a major eruption in 1983 that forced the evacuation of island residents. This event was one of the most powerful in the region and shaped the modern history of the island.

Local farmers work the slopes and surrounding areas, taking advantage of the fertile volcanic soil that enriches their crops. This agricultural tradition remains central to how the community lives and sustains itself today.

Reaching the island requires authorization from local authorities and it is wise to check current volcanic activity before visiting. Visitors should gather local information on-site since conditions can vary depending on weather and volcanic activity.

The mountain forms the entire island and is one of the few volcanoes completely surrounded by water. This rare geographical arrangement makes it a distinctive feature in the Gulf of Tomini.

Elevation above the sea: 507 m

GPS coordinates: -0.17000,121.60800

Latest update: December 12, 2025 09:04