Ambrym is a volcanic 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.
Ambrym (aka Ambrin) was so named by Captain Cook, who anchored off there in 1774. It means "here are yams" ("ham rim" in the Ranon language).
Located near the center of the long Vanuatuan archipelago, Ambryn is roughly triangular in shape, about 50 km (31 mi) wide. With 677.7 square kilometres (261.7 sq mi) of surface area, it is the fifth largest island in the country.
The summit at the center of the island is dominated by a desert-like caldera, which covers an area of 100 square kilometres (39 sq mi).