Lake Ashi, located in the Hakone area of Kanagawa Prefecture, Japan, is a crater lake formed within the caldera of Mount Hakone. Visitors can take sightseeing cruises, walk along the lakeside paths, visit Hakone Shrine, and enjoy views of the surrounding mountains and, on clear days, Mount Fuji. The lake was created by volcanic activity around 3,000 years ago, and it remains an important feature of the region, with historic sites, transport connections, and traditional accommodation found nearby along its shores.