Mount Ibu, Stratovolcano in North Halmahera Regency, Indonesia.

Mount Ibu is a stratovolcano on the north-west coast of Halmahera island, in North Halmahera Regency. Its truncated summit holds nested craters: the inner crater is 1 km wide and 400 m deep, the outer 1.2 km wide. A large parasitic cone lies north-east of the summit and a smaller one south-west, feeding a lava flow down the west flank; a group of maars sits on the western and northern sides.

Mount Ibu is a stratovolcano on the northwest coast of Halmahera, part of the Pacific Ring of Fire. Its truncated summit holds nested craters: the inner one is 1 km wide and 400 m deep, the outer 1.2 km wide. A large parasitic cone lies northeast of the summit and a smaller one southwest, feeding a lava flow down the west flank; maars sit on the western and northern sides. In 2023 the volcano recorded 21,100 eruptions, and on 16 May 2024 the Volcanological Survey of Indonesia raised its highest alert level, evacuating seven villages.

The name Ibu means "mother" in Indonesian, and the volcano is one of 127 active volcanoes in the Pacific Ring of Fire. Its eruptions shape daily life nearby: in 2024 seven villages were evacuated and ash fell on Gam Ici, where displaced residents had been relocated.

Visitors should observe designated safety zones established around the active volcano to protect against volcanic hazards. It is important to follow local guidelines and check current information about volcanic activity and access restrictions before planning a visit.

In 2023 the Volcanological Survey of Indonesia recorded 21,100 eruptions from Mount Ibu, making it Indonesia's second most active volcano that year. Between 1 and 19 January 2025 alone it erupted 1,079 times, prompting the highest alert level.