Located at the summit of Washigamine Mountain at an altitude of 188m, it is known as a spectacular spot offering a panoramic view of the Seto Inland Sea.

From the observation deck, you can see Ogijima to the north, Naoshima to the northwest, Shodoshima to the northeast, and Takamatsu city to the south.

Washigamine Observation Deck is about a 5-minute walk from the exit of Onigashima Great Cave.

It is about a 45-minute walk from the port, but there is a bus that goes to Onigashima Great Cave, so it is easier to take that.