Ojiro Valley located at the source of Yadagawa River is a place where deep nature remains as it is. A valley called Ojirodani is formed in a deep cliff as if the valley threads across deep primeval forests. In spring, rhododendron trees growing in clusters stand out in tender greenery. In fall, leaves change their colors into red and yellow. Visit the valley and see such colorful seasonal changes. Besides, the valley is one of a few areas preserving natural alpine vegetation. Visitors can enjoy fishing landlocked masu salmons and red-spotted masu trouts in the mountain stream.