Karai volcano is the highest volcano in the Sulu Range in north-central New Britain off Bangula Bay. The Sulu Range consists of a cluster of partially overlapping small stratovolcanoes and lava domes. There are no historic eruptions, but in 2006, a vigorous new fumarolic vent opened, preceded by vegetation die-off, seismic swarms and landslides.

The 610-m Mount Malopu at the southern end forms the high point of the basaltic-to-rhyolitic complex. Kaiamu maar forms a peninsula with a small lake extending about 1 km into Bangula Bay at the NW side of the Sulu Range. The Walo hydrothermal area, consisting of solfataras and mud pots, lies on the coastal plain west of the SW base of the Sulu Range.

No historical eruptions are known from the Sulu Range, although some of the cones display a relatively undissected morphology.

(Smithsonian GVP volcano information)