Oirase Streams covered by deep natural forests. It is a landscape full of dynamism that causes the flow of Innumerable changes.

The cliffs of Oirase Stream are pumice and volcanic ash deposits at high temperatures, which can be regarded as welded tuff which is generated by heat and gravity, which is impressing the landscape of Oirase.

Along the mountain stream, a roadway and a sidewalk are made almost at the same height as the flow, and you can enjoy a different landscape from the view of the valley from the ridge and the mountainside road.

Branches of big trees overlap and cover the expanse, a green tunnel followed by a walking path. The journey of about 14 kilometers walking while being fascinated by forest beauty is continuous of impression.