Mount Fuji is surrounded by five lakes that were formed during a very powerful eruption 1,200 years ago. Formerly there were only four lakes but the biggest one split during the eruption into two lakes that are connected by underground water tunnels.
The area that sank, known as Oshino Hakkai 忍野八海, is plenty of water springs and natural ponds. Nowadays the area attracts many tourists. The locals are very proud of the purity of the water, they say it’s one of the best waters in Japan.
This pond with fishes had the most transparent water of all. Although it was very deep we could clearly see the bottom of the pond.
How to get there:
Take the Fujikyuko line until Fujisan station and from there take a bus until Ohashi or Oshino-Hakkai-Iriguchi stations. From any of those two stations it is a five minute walk until the water springs area.