The upper reaches of the Kawahara River flow for a long stretch through the spectacular Hyodo Valley in Kamitsuemachi, Hita, in Oita Prefecture.

The Hyodo Valley has an altitude of 600m and the mountain stream has very clear, translucent water with a refreshing and brisk aspect. It is also known as an excellent spot for masu salmon fishing, and a common sight is that of families fighting against a masu salmon at the fishing spot.

There are various waterfalls that tumble over rough and jagged rocks, making an intense scene that is enhanced by color contrasts in the four seasons. Many wild birds, such as the crested kingfisher, the akashiyobin, and the grey wagtail, nest along the ravine, allowing people to enjoy birdwatching as well. In the autumn, the maple trees turn a rich red, and if the weather is fine, these and the ginkgo trees, along with the other trees in the valley appear to shine. Because of its secluded setting, the Hyodo Valley is an excellent area to experience nature.