Vanuatu is an archipelago of 83 islands, of which two Matthew and Hunter are also claimed by the French overseas department of New Caledonia. Of all the 83 islands, 14 have surface areas of more than 100 square kilometers, from largest to smallest: Espiritu Santo (3956 km), Malakula (2041 km), Efate (900 km), Erromango (888 km), Ambrym (678 km), Tanna (555 km), Pentecote (491 km), Epi (445 km), Ambae or Aoba (402 km), Vanua Lava (334 km), Santa Maria (328 km), Maewo (304 km), Malo (180 km) and Anatom or Aneityum (159 km).
Most of the islands are mountainous and of volcanic origin, and have a tropical or sub-tropical climate. The nation’s largest towns are the capital Port Vila, which is situated on Efate, and Luganville, on Espiritu Santo. The highest point in Vanuatu is Mount Tabwemasana, at 1879 m (6158 ft), on the island of Espiritu Santo. There are several active volcanoes in Vanuatu, including Yasur on the island of Tanna, one of the world’s most accessible volcanoes, as well as several underwater ones.