The flag of Bougainville, an autonomous region in Papua New Guinea (PG), represents the aspirations and identity of the Bougainville people. It features a white background symbolizing peace, with a red diagonal stripe representing their struggle for independence and self-determination. The blue triangle represents the island's natural resources and the ocean that surrounds it, while the green triangle represents the land and agriculture. Together, these elements embody the spirit and hopes of Bougainville (PG-NSB).