Ryumon Waterfall is located near Ryumonji Temple in Kokonoe, Kusu County, Oita Prefecture. It is 20m tall and 40m wide.

The water of Ryumon Waterfall falls in two stages with a basin in the middle. In summer, many people come to play in the water and slide down the fall on the smooth rocks.

In the Kamakura period, the Chinese monk Rankei Doryu was officially invited to Japan and visited here. He felt that the waterfall was similar to Ryumon Waterfall in Kanan and named it Ryumon. Moreover, he founded a temple and named it Mt Kichijo Ryumonji Temple.

According to legend, a huge snake lives in the waterfall and during thunderstorm appears and winds itself around the Niomon gateway of Taiheiji Temple.
Nearby are the Ryumon Hot Springs.

The symmetry of the waterfall is especially beautiful and the area is a well-known site for viewing fall scenery. Ryumon Waterfall is a popular playground for children as well as a beauty spot.