city, eastern Hiroshima ken (prefecture), western Honshu, Japan. Innoshima is coextensive with a small offshore island in the Inland Sea, originally settled by pirates. After the decline of piracy in the 17th century, the island was left to fishermen. After the Russo-Japanese War (1904–05), Hitachi Shipbuilding established a modern dockyard there. In 1964 the 100,800-ton supertanker Ōimaru, then the largest ship ever built on a building slip, was launched. Innoshima was designated a city in 1953. Pop. (2005 prelim.) 26,677.