Saruo Falls, Natural waterfall in Kami, Japan

Saruo Falls is a waterfall on a tributary of the Yadogawa in Kami, Hyogo Prefecture, formed by a rhyolite dike. It drops in two stages: an upper fall of 39 metres and a lower fall of 21 metres, the latter resembling a monkey's tail. It is counted among the Tajima Three Waterfalls and Japan's Top 100 Waterfalls.

In the past, the lord of Muraoka domain is said to have visited the falls to eat traditional Somen noodles while listening to the water. This association with local feudal lords helped establish the site as a place of note in the region.

The name Saruo means "monkey's tail", taken from the lower drop, whose falling water is said to resemble a monkey's tail. The upper drop is 39 metres and the lower 21 metres. Each year on the second Sunday of July the Saruo Falls Festival is held here, with a large-scale somen noodle-sliding event, a custom said to go back to the Muraoka domain lords who enjoyed somen nagashi at the falls in summer.

The falls are reached by a short loop trail starting from the parking area, which is manageable for most visitors. Restrooms and a small cafe are available near the trailhead, so there is no need to rush back after seeing the falls.

In winter, the water freezes and coats the surface of the falls with ice formations that cover the entire rock face. This seasonal change makes the falls look nothing like they do during the rest of the year, drawing visitors in colder months for a very different experience.