Ryuou Valley is one of the most popular tourist spot in Kinugawa Onsen. It was made the erosive action on Lava by Kinugawa River. The lava came from the eruption that happened 22 million years ago.
The entire valley is about 3km long between Kinugawa Onsen and Kawaji Onsen. There are many unique rocks and beautiful waterfalls.
It is known as one of the best hiking valley during Autumn because it has great Koyo.