National Parks of Japan Protecting our natural heritage for future generations

Towada, Oirase, HakkodaTowada-Hachimantai National Park


Oirase-Keiryu (Oirase stream) Long Trail Course

Oirase-Keiryu (Oirase stream) Long Trail Courseの写真
Time Required:
4 h 41 min.
14.3 km
Walk upstream along beautiful Oirase stream toward its source, Lake Towada.

Course Outline

The Oirase stream is the only river flowing from Lake Towada, stretching about 14 km from Nenokuchi to Yakeyama. The walk along the mountain stream has gentle ups and downs, it’s good for forest bathing. You will enjoy an inspiring landscape created by the ever-changing flow of water amid deep natural woods. You can walk to Lake Towada, or use a rental bike as well. A bus route runs parallel to the walk. You can take a bus from a bus stop on the way.


Oirase Keiryu-kan (Oirase Stream Museum)
Oirase Keiryu-kan (Oirase Stream Museum)

A perfect place to start a walk

Located on Yakeyama at the furthest point downstream on the Oirase stream, Oirase Stream Museum offers a variety of information as well as a bike rental service. Guided tours start from this facility. While walking the hiking trails along the river, you can appreciate the forest trees, wild birds, and other natural surroundings of Oirase. During winter, the “Snow rambling tour” is also recommended. You can enjoy snowshoeing at the snow-covered Oirase Area with a guide.

Flow of the mountain stream
Flow of the mountain stream

Beautiful mountain stream, stretching for 14 km

The main attraction of Oirase is the beautiful mountain stream that flows through the forest. As you walk alongside the stream, you will find superb views of waterfalls and rapids. It’s not too much to say all locations are the best for photography. On your visit, please fully enjoy the most beautiful mountain streams representing Japan, such as the well-known “Ashura Stream” and “Sanmidare Stream”, trees lining the streams and many wild birds.

A Tunnel of greenery
A Tunnel of greenery

A cool and refreshing walking path

Surrounding the Oirase stream are Japanese beech, Japanese oak, Japanese Judas tree, Japanese horse-chestnut, and other broad-leaved trees. The fresh greenery in spring and colorful foliage in autumn are especially beautiful. In summer, it looks as if there is a green tunnel. You can enjoy a variety of plants and flowers of each season, while enjoying a full-body, sensory experience of the forest's abundance.

Course Map

Oirase-Keiryu (Oirase stream) Long Trail Course

Course Time

Starting Point
6 min.
0.5 km
Oirase Keiryu-kan
75 min.
4.3 km
Sanmidare Stream
15 min.
0.7 km
35 min.
1.7 km
Ashura Stream
25 min.
1.1 km
Kumoi no Taki Waterfall
70 min.
3.4 km
Shiraito no Taki Waterfall
25 min.
1.1 km
Choshi-otaki Waterfall
30 min.
1.5 km
*Course time and distance are estimates.