In the upstream region of Hatonosu-keikoku Valley sits Shiromaru Dam, which was constructed in 1963 and holds back the Tama-gawa River.
The dam has a underground facility called "Gyodo" where you can watch passing school of fish from the Tama-gawa River to the dam lake.
Further upstream from the dam lake is Kazuma-kyo Gorge.
One of Okutama's most peaceful valleys, the area is very popular among fishers.
- Gyodo: 10:00 - 16:00 (April - November)
- Gyodo: Irregular (April - November)
- Gyodo: December - March
Access / Public Transport
- 10 minutes walk from JR Shiromaru Station