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The gorge formed by the Yoshino River is quite spectacular. The steepest and most rugged sections lie in the area between JR Koboke Station to the north and Tosa-Iwawhara Station to the south (with JR Oboke Station in the middle). Aside from rafting, pleasure boat tours are operated out of the Hotel Mannaka, offering views from within the gorge but without the need to get wet. The gorges can also be viewed by either walking or driving along Rt 32. A fairly decent sidewalk is set up along the road between the Oboke Michi-no-Eki (10 minute walk north of JR Oboke Station) and the WestWest rest area, through which the sheer rock cliffs blast up from the river. This walk takes about 30-40 minutes one way. The JR train line follows this route too (on the opposite side of the river). The train's views are occasionally obstructed by small tunnels, but it doesn't necessarily reduce the impressive sights too badly.
Arranges half/full-day rafting trips from ¥5500/10000, mostly mid-spring to mid/late autumn (lunch included for full day). Canyoning is offered as well. A very chilled out group of experienced guides are here who seem to like having a good time. Good English is spoken by all the staff. Located just near Tosa-Iwahara station. Station pick-up from Oboke is also available. Cafe and accommodation services are also available as well.