Lake Ashi, also referred to as Hakone Lake or Ashinoko Lake, is a scenic lake in the Hakone area of Kanagawa Prefecture in Honshū, Japan. It is a crater lake that lies along the southwest wall of the caldera of Mount Hakone, a complex volcano that last erupted in 1170 CE at Ōwakudani. The lake is known for its views of Mount Fuji, its numerous hot springs, historical sites, and ryokan. The lake is located on the Tōkaidō road, the main link between Kyoto and Tokyo. A number of pleasure boats and ferries traverse the lake, providing scenic views for tourists and passengers. Several of the boats are inspired by the design of sailing warships.
Most visitors to Lake Ashi stay in one of the hotels or ryokan located in the area to visit some of the local attractions. There is also a campsite at the north end of the lake. Hakone Shrine is a shrine that has been visited by shōgun, samurai, and many travelers over the centuries. Large sections of the Old Tōkaidō road are preserved here. Onshi Park was the summer retreat for the imperial family that is now a public park. Taking the aerial tram Hakone Ropeway to The Great Boiling Valley.