Maug is the third island in the proposed "National Park of the Sea."
Maug consists of three islands that surround the caldera of an ancient volcano. The ancient volcanic peak has eroded and is now a deep and spacious natural harbor. Steep cliffs border the islands and the landscape on the north and west islands is dominated by columns of basalt resembling tombstones. Vegetation on Maug consist mostly of grasses with a few coconut palms