Papua New Guinea
The volcanic island of Garove is part of the Witu Islands and once had a 5-kilometer-wide (3.1 miles) caldera. The island was historically used to produce copra and cocoa, and in fact, still is today. Most of the villages are located around the exterior of the volcano. Steep cliffs explain why there is only one area settled on the inside. A promontory at the entrance’s southwestern corner is taken up by the school and the catholic church of the village of Widu, the only village inside the caldera.