Lake Ashi (Japanese: Ashinoko) was formed in the caldera of Mount Hakone after the volcano's last eruption 3000 years ago. Today, the lake with Mount Fuji in the background is the symbol of Hakone.
The best views of the lake in combination with Mount Fuji can be enjoyed from Moto-Hakone, from the Hakone Detached Palace Garden and from the sightseeing boats cruising the lake.
Note however, that clouds and poor visibility often block the view of Mount Fuji, and you have to consider yourself lucky if you get a clear view of the mountain. Visibility tends to be better during the colder seasons of the year than in summer, and in the early morning and late evening hours.
Two companies, Hakone Sightseeing Boats and Izuhakone Sightseeing Boats, operate boats between Moto-Hakone and Hakonemachi at the lake's southern shores and Togendai and Kojiri at the northern shores.
A boat cruise from one end of the lake to the other takes roughly 30 minutes and costs 970 Yen. The Hakone Free Pass is valid on the pirate ship shaped Hakone Sightseeing Boats but not on boats operated by Izuhakone.
how to get there
From Odawara and Hakone-Yumoto
Frequent buses connect Odawara via Hakone-Yumoto with Moto-Hakone and Hakonemachi at the southern end of Lake Ashi. The one way journey from Odawara takes about 50 minutes and costs 1150 Yen. From Hakone-Yumoto it takes about 35 minutes and costs 930 Yen. The Hakone Free Pass is valid on Hakone Tozan buses but not on Izuhakone buses.
There is also a frequently served Hakone Tozan Bus line from Odawara via Hakone-Yumoto to Togendai at the northern end of Lake Ashi (covered by the Hakone Free Pass). The one way journey from Odawara takes about 50 minutes and costs 1200 Yen. From Hakone-Yumoto it takes about 35 minutes and costs 1020 Yen.
A slow and scenic way of approaching Lake Ashi from Odawara or Hakone-Yumoto is taking the Hakone Tozan Railway to Gora, followed by a cablecar and ropeway ride to Togendai at the northern end of of the lake. From Togendai one can continue by sightseeing boat to Moto-Hakone or Hakonemachi. The whole journey is covered by the Hakone Free Pass.