Ryumon Falls, Natural waterfall in Nasukarasuyama, Japan

Ryumon Falls is a waterfall on the Egawa, a tributary of the Naka River, in Nasukarasuyama, Tochigi Prefecture. It is 65 metres wide and drops 20 metres. Two potholes, called Onkama and Okama, sit midway down the fall and are named after a giant serpent said to have lived there.

The waterfall lies on the Egawa, a tributary of the Naka River, in the Takihara area of Nasukarasuyama. In 1993 the city opened the Ryumon Furusato Mingei-kan at the entrance as a base for visitors; it was fully renovated and reopened on 22 April 2021 at a cost of 140 million yen, adding the Ryumon Cafe. The JR Utsunomiya Line's Karasuyama Line runs across the top of the falls.

The name Ryumon comes from two potholes, Uokama and Okama, in the middle of the falls, said to have been named for a giant serpent that lived there. The falls are also known for cherry blossoms and autumn leaves, and in mid-to-late November salmon can be seen swimming upstream.

Ryumon Falls is a five-minute walk from JR Takisawa Station on the Utsunomiya Line. From the Ryumon Furusato Mingei-kan at the entrance, stairs lead down toward the base of the falls; spray from the cascade makes the steps slippery, so descend with care.

The waterfall has two potholes mid-way down, called Onkama (female pot) and Okama (male pot), named after a giant serpent said to have lived there. In mid-to-late November, salmon can be seen swimming upstream. The JR Karasuyama Line crosses directly above the falls, making it a photography spot.