Tench Island, also known as Enusi Island, is a small (55 ha), low-lying (17 m maximum height above sea level), coral island in the St Matthias Islands group in the Bismarck Archipelago of Papua New Guinea. Administratively, it is part of New Ireland Province and lies about 100 km north of Kavieng, the provincial capital. It has a human population of about 100. The language of Tenis is spoken on the island, which has around 30 native speakers.