Bougainville, BOO guhn vihl, is the largest of the Solomon Islands. It lies north of Australia and is part of the nation of Papua New Guinea. Bougainville covers about 3,880 square miles (10,050 square kilometers). Much of Bougainville is mountainous. Its main products include cocoa, copra (dried coconut meat), and timber. It also has copper and gold deposits. About 200,000 people, mostly Melanesians, live on the island.