The fourteen of Vanuatu's islands that have surface areas of more than 100 square kilometres (39 sq mi) are, from largest to smallest : Espiritu Santo, Malakula, Efate, Erromango, Ambrym, Tanna, Pentecost, Epi, Ambae or Aoba, Gaua, Vanua Lava, Maewo, Malo and Aneityum or Anatom. The nation's largest towns are the capital Port Vila, on Efate, and Luganville on Espiritu Santo. The highest point in Vanuatu is Mount Tabwemasana, at 1,879 metres (6,165 ft), on the island of Espiritu Santo.
Vanuatu's total area is roughly 12,274 square kilometres (4,739 sq mi), of which its land surface is very limited (roughly 4,700 square kilometres (1,800 sq mi)). Most of the islands are steep, with unstable soils and little permanent fresh water. One estimate, made in 2005, is that only 9% of land is used for agriculture (7% with permanent crops, plus 2% considered arable). The shoreline is mostly rocky with fringing reefs and no continental shelf, dropping rapidly into the ocean depths.
There are several active volcanoes in Vanuatu, including Lopevi, Mount Yasur and several underwater volcanoes. Volcanic activity is common, with an ever-present danger of a major eruption. Vanuatu is recognised as a distinct terrestrial ecoregion, known as the Vanuatu rain forests. It is part of the Australasia ecozone, which includes New Caledonia, the Solomon Islands, Australia, New Guinea and New Zealand.
Despite its tropical forests, Vanuatu has a limited number of plant and animal species. The climate is tropical, with about nine months of warm to hot rainy weather and the possibility of cyclones and three to four months of cooler, drier weather characterised by winds from the southeast. The water temperature ranges from 22 °C (72 °F) in winter to 28 °C (82 °F) in the summer. Cool between April and September, the days become hotter and more humid starting in October. The daily temperature ranges from 20 to 32 °C (68 to 90 °F). South easterly trade winds occur from May to October.
Vanuatu has a long rainy season, with significant rainfall almost every month. The wettest and hottest months are December through April, which also constitute the cyclone season. The driest months are June through November. Rainfall averages about 2,360 millimetres (93 in) per year but can be as high as 4,000 millimetres (160 in) in the northern islands.
Vanuatu was first inhabited by Melanesian people. The first Europeans to visit the islands were a Spanish expedition led by Portuguese navigator Fernandes de Queirós, who arrived on the largest island in 1606. As the Portuguese and Spanish monarchies had been unified under the king of Spain in 1580 (following the vacancy of the Portuguese throne, which lasted for sixty years, until 1640, when the Portuguese monarchy was restored), Queirós claimed the archipelago for Spain, as part of the colonial Spanish East Indies, and named it La Austrialia del Espíritu Santo.
In the 1880s, France and the United Kingdom claimed parts of the archipelago, and in 1906 they agreed on a framework for jointly managing the archipelago as the New Hebrides through an Anglo–French Condominium. An independence movement arose in the 1970s, and the Republic of Vanuatu was founded in 1980.