Ambrym is an island in the archipelago of Vanuatu (formerly known as the New Hebrides). It is well known for its highly active volcanic activity that includes lava lake formation. With 677.7 square kilometres (261.7 sq mi) of surface area, it is the fifth largest island in the country. Several times per century, Ambrym volcano has destructive eruptions. The summit of the volcano contains a desert-like caldera which covers an area of 100 square kilometres (39 sq mi).
With the neighbour island of Malakula and a few smaller islands, it forms Malampa Province. Its largest settlement is the village of Eas. The population of 10,000 inhabitants lives mainly off coconut plantations.