The Island of Hawaii is the largest and the southeastern-most of the Hawaiian islands. It is the largest island in the United States. The county seat and largest city is Hilo. There are five volcanoes on the Island of Hawaii: Kohola, Mauna Kea, Hualālai, Mauna Loa, and Kilauea. My husband and I visited the Island of Hawaii in May 2010. We hope to make a return visit one day.