Hawaii

Volcanic island, Hawaii, U.S. It lies south of Maui Island and constitutes Hawaii county. Known as the Big Island, it is the largest (area 4,028 square miles [10,433 square km]) and southeasternmost of the Hawaiian Island group. It is the youngest geologically and was formed by five volcanoes connected by lava saddles (ridges). Kilauea is the world's most active volcano. The island is roughly