Ōsen Falls

Ōsen Falls is a natural waterfall in Kusatsu that descends approximately 25 meters over distinctive reddish rock formations, splitting into multiple streams as it flows downward. The water navigates a series of stone layers and creates a complex pattern of cascades that shifts with seasonal water levels.

The waterfall formed through natural geological processes that shaped the distinctive red rock and carved the water channels over millennia. The surrounding area developed ancient forests, including trees that have stood for several centuries and continue to grow in the rocky landscape.

The falls name reflects Japanese appreciation of water features, with Ōsen suggesting feminine qualities evident in the water patterns over rocks.

The waterfall can be reached by foot from the parking area, with a walk of about 30 minutes to the main viewing point. Two different paths are available, allowing visitors to choose a route that matches their preferred level of exertion.

The reddish color of the rocks comes from iron oxides in the stone and creates a striking visual contrast with the white water. This color combination becomes especially vivid on clear days when sunlight emphasizes the difference between rock and water.