Kolombangara is an island in the New Georgia Islands group of the Solomon Islands. Almost perfectly round in shape and about 15 km across, the island is a stratovolcano that reaches an altitude of 1,770 meters at Mount Veve. The island forms part of the southern boundary of the New Georgia Sound; to the northwest the Vella Gulf separates it from Vella Lavella and Gizo, while to the southeast New Georgia lies across the Kula Gulf.