The Naioroppu Waterfall with a width of 1 m and a height of 30 m is in the stream of the Jusen River, a tributary river of the Teshio River in Nisshin, Nayoro City, Hokkaido. The name “Naioroppu” come from “Nayoroputo”, which means “a river mouth” in Ainu. The city name of “Nayoro” also originates in this word. As the tributary Nayoro River flows into the main stream of the Teshio River in the city, it was named “Nayoro.” At the Naioroppu Waterfall, water flows down the drop of 30 m, changing the directions according to the stepped rocks. It increases in the volume of water in May and June, which makes the waterfall look more dynamic, but it usually flows down calmly. In summer a lot of people visit to seek for coolness. The Naioroppu waterfall is a beautiful waterfall, which makes us sense Japanese elements