These comprise more than 30 islands, including Nakajima, located about 10 km from Matsuyama port. Nakajima thrived as the midpoint in the navigation route between Kyushu and the Kinki area, and it was also a base for the Suigun. Nearly the whole area falls within the Seto Inland Sea National Park. The area has rich fisheries and many fishermen visit. The islands also produce mandarins and other citrus. The Nakajima triathlon is held here once a year.