Oboke Gorege/Koboke Gorge

Oboke and Koboke are gorges formed by the rapids of the Yoshino River cutting through the Shikoku Mountains. The name “Boke” is said to derive either from “hoki,” meaning a steep cliff or dangerous place, or from the idea that it is dangerous whether you walk with big steps (o-boke) or small steps (ko-boke). The exposed rock faces are said to be layers uplifted about 200 million to 100 million years ago, later revealed by erosion from the Yoshino River. Oboke–Koboke is designated as a National Scenic Spot and Natural Monument, and is famous for its continuous 5 km stretch of unusual rock formations. Koboke, about 3 km downstream from Oboke, is especially known for the beauty of its sandstone schist rock surfaces (Koboke sandstone schist). You can enjoy sightseeing boat rides, kayaking, and rafting while viewing seasonal scenery such as cherry blossoms in spring, fresh greenery in summer, and autumn leaves. Walking slowly between Oboke and Koboke to savor the gorge scenery and fresh air is also recommended. From late March through the end of May, a huge display of carp streamers donated from around Japan swims over the Oboke Gorge—a spectacular sight.