Oboke Gorge (大歩危, Ōboke) and neighboring Koboke Gorge (小歩危) a little ways downstream, are narrow, steep sided gorges near the entrance to the Iya Valley and popularly combined with a visit there. Cut by the swirling rapids of the Yoshino River, their names mean "big dangerous steps" and "small dangerous steps" as their jagged, rocky walls can be perilous to navigate.
The gorges are one of the leading outdoor destinations in Japan, rivaling Minakami in Gunma Prefecture, and are known for their beautiful natural scenery and for the variety of outdoor attractions, such as whitewater rafting and canyoning, that can be enjoyed on the river.
The hourly limited express trains between Okayama and Kochi stop at Oboke Station along the way. Alternatively, Oboke can be reached by train (30 minutes, 460 yen by infrequent local train or 790 yen for an unreserved seats on an hourly limited express train) or bus (40 minutes, 670 yen, every 2-3 hours) from Awa Ikeda Station.