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Ōmishima Island

Ōmishima Island (大三島, Ōmishima) is the largest island in the Geiyo Islands chain, and the westernmost which accommodates the Nishiseto Expressway between Honshu and Shikoku. It is located in the Seto Inland Sea. The island's highest peak is Washigatozan (鷲ヶ頭山) at an altitude of 437 m (1,434 ft).
Location:  Seto Inland Sea
Length:  12.8 km (7.95 mi)  
Width:  6.2 km (3.85 mi)  
Coastline:  88.8 km (55.18 mi)  

Ōmishima Island  Click to go to Wikipedia