This course is geared for people working towards whitewater paddling, who have already had experience paddling and have been on class 2 rivers a few times.

Classification of rivers is sometimes hard to judge but here are some examples of other Japanese rivers that you might be associated with.
Yoshino River in Nara= Class 2, Kitayama River in Wakayama = Class 3, Yoshino River (Koboke section) in Shikoku =Class 4.