Gaua (also known as Santa Maria Island)'s the largest of the Banks Islands in Torba Province of northern Vanuatu. It covers 342 km². Physical geography It's rugged terrain, reaching up to Mount Gharat (797 m), the peak of the active stratovolcano at the center of the island. The most recent eruption was in 1982. The island was evacuated for four months in 1974 due to volcanic activity. The volcano has a 6 x 9 km caldera, within which lies a crater lake known as Lake Letas, the largest la… (More on Gaua)