A region where it is very difficult to tour the islands without a car (excluding Udon Prefecture)
Ira
・Red islands = Inhabited islands with regular ferry service ・Brown islands = Inhabited islands accessible without a boat ・Colored islands in each area = Uninhabited islands or formerly inhabited islands
[Shikoku:四国地方] 54 inhabited islands, 11 island accessible without a boat
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Kagawa(香川): 23 inhabited islands , 3 island accessible without a boat