Mt. Iinoyama (263.5 m) is a mountain in Suo-Oshima that towers over the foot of the Oshima Bridge. The summit observation platform not only has a view of Oshima Ohashi Bridge, you can also see one of the three major Japanese tidal systems known as the Oshima Ohashi Bridge Eddy and a view extending all the way to Murotsu Peninsula and Hiroshima Prefecture.