Unasawa Great Falls (海沢大滝, otaki) is one of the waterfalls located in Unasawa Valley, Okutama, Tokyo. It is one of the best waterfalls in Tokyo. It is about 30m high.
Tourist Info.
There is parking and restroom at the entrance of its trekking course.
Access
0. at Haijima Station.
1. use JR Ome Line to Okutama.
2. walk south 2 hours.
15 min
New Wave Samurai Movie. 
映画好き集まれ！ 
Unasawa Valley is located deep side of Okutama, Tokyo. It is one of the best Tokyo’s nature spots. There are many beautiful waterfalls and the trekking course reads to Mt. Ogaku. The trekking course contains some steep hillsides that require rope to climb. To the way to Great Falls, it is not so hard walking.