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The Oboke Gorge (Ōboke) has unusual geological strata, including a rudaceous schist formation designated as a natural monument.
Oboke Gorge and neighboring Koboke Gorge a little ways downstream, are narrow, steep sided gorges near the entrance to the Iya Valley.
Their names mean "big dangerous steps" and "small dangerous steps" as their jagged, rocky walls can be dangerous to navigate.
Yoshino River has cut through the Shikoku Mountains over the ages, eroding crystalline schist into winding gorges with myriad shapes and forms, which almost look like marble statues. 

The gorges are one of the leading outdoor destinations in Japan and are known for their beautiful natural scenery and for the variety of outdoor attractions.

River Rafting
The upstream of the Yoshino river, called Oboke and Koboke is famous for its torrent.
And the river  is one of Japan's most well known destinations for whitewater rafting.
There are several outdoor adventure companies which offer guided tours.
Full day and half day rafting tours are available, as well as a variety of other adventures sports such as hydrospeed and canyoning.

Hours: 8:00 to 20:00 
Season: April to November 
Admission: Half day tours start from 5200 yen
Some company has an English web site.

Access Information
Rental car stores are available around Oboke and Awa Ikeda Stations.
A rental car is recommended, particularly for visiting the less traveled Oku Iya area.
Note: The roads are very narrow and have frequent blind curves, which make driving both hazardous and slow.


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