Ooboke and Koboke are the deep gorges formed by Yoshino River, and they
are located near the western end of Tokushima Prefcture.
They are in the deep mountain, and are positioned about 90 km west of Tokushima city, about 40 km south of Kotohira town, and about 50 km northeast of Kochi city.
Around these gorges, Yoshino River flows from south to north.
Ooboke gorge is at upriver, and Koboke gorge is about 6 km downriver (north) of Ooboke.
Two different names have been given, but in the section between both gorges, there are steep rocky cliffs and fast flows of Yoshino River continuously.
These gorges have been formed by the erosion of Yoshino River for over two hundred million years.
The kanji characters given to the names also are unique.
The characters for Ooboke mean "danger if you stride", and ones for Koboke mean "danger even if you walk with short steps".
These gorges has been on one of the few routes connecting Seto Inland Sea side and Pacific Ocean side in Shikoku Island, and here has been a traffic chokepoint since ancient times.
Ooboke has very rough rocks and river flows with a volume of water.
By contrast, Koboke has narrower, more winding, and faster river flows than Ooboke, and it is said that the flowing speed of the river is the fastest in Japan.
At Ooboke, small pleasure boat is operated. We can enjoy the scenery on
the boat for about 30 minutes.
And there is a museum of stone "Lapis Oboke" near National Route 32.
Around Koboke, we can enjoy rafting.
Many tour companies organize the rafting tours for beginners in Koboke.
To visit these gorges, it is convenient to use JR Dosan Line.
The limited expresses stop Ooboke station, but don't stop Koboke station.
The boarding point of pleasure boat and Lapis Oboke are about 1.5 km from the station.
And you can see the gorges on the running train.
For a few minutes, you can see them on the right hand of the train to Kochi.
By limited express "Nanpuu", to
Ooboke, about 1 hour and 35-45 minutes from Okayama.
By limited express "Shimanto", about 1 hour and 20-30 minutes from Takamatsu.
By limited express of them, about 45 minutes from Kotohira, about 50 minutes from Kochi.