Ōshima (大島) is an inhabited island in the Geiyo Islands in the Seto Inland Sea of Japan, lying between the larger islands of Honshū and Shikoku.

Overview

Ōshima is located in the north of Ehime prefecture, and has an area of 41.89 sqkm. Administratively, it was formerly divided between the towns of Yoshiumi and Miyakubo of Ochi District, Ehime; however, in January 16, 2005 both towns were absorbed into the city of Imabari. The highest elevation on the island is Mount Kirō, at 381.9 m. Compared to other islands in the Geiyo Archipelago, the island has many flat areas, which has permitted the development of rice paddy fields. Other economic activities have traditionally included the cultivation of citrus fruits, mainly mikan, a small shipyard and stone quarries. The island is on the Shimanami Kaidō, an expressway between Honshū and Shikoku, and is linked to Hatakajima by the Hakata-Ōshima Bridge and Kurushima by the Kurushima-Kaikyō Bridge. The expressway has placed the island within commuting distance of Imabari.