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Hawaii, volcanic island, Hawaii, U.S. It lies southeast of Maui island and constitutes Hawaii county. Known as the Big Island, it is the southeasternmost and largest of the Hawaiian Islands. Its area of some 4,030 square miles (10,438 square km) continues to grow as Kilauea, the world’s most active volcano, continues to pour lava into the ocean. The island is formed by five volcanoes (Hualalai, Kilauea, Kohala, Mauna Kea, and Mauna Loa) that are connected...