By road
It is recommended to travel in this area by car. If you get there by train, you'll have a long walk along a noisy road without sidewalks. It is also hard to find entry points for hiking trails without a car. Unfortunately, the nearest car rentals are located quite far away: Marugame, Takamatsu, and Tokushima.
National Highway 32 winds along the Yoshino River through the pristine valley. Coming from Osaka, Kobe or Tokushima, take the expressway and exit at Ikeda. Then follow route 32 towards Kochi for about 20 kilometers to Oboke.
A tunnel also connects Oboke to the western Iya Valley.
By train
Both Oboke and Koboke have stations on the JR Dosan Line from Kochi to Takamatsu via Ikeda. Stops in Koboke are rare, though.
By bus
Buses to the Iya Valley run sparsely, especially on weekdays around 2 per day.