Ashinoko and the volcanic lake that defines Hakone
Published on 08/16/2026 at 14:57 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Ashinoko is the Japanese name for Lake Ashi, a crater lake in Hakone in Kanagawa Prefecture in Japan that sits within the broader Hakone volcano.
A volcanic lake shaped by Hakone’s eruptions
Ashinoko lies within the caldera of Mount Hakone, a complex volcano whose activity over tens of thousands of years created the basin that holds the lake. The water body occupies part of the southwestern side of the volcanic structure, framed by ridges and peaks that belong to the Fuji?Hakone?Izu National Park.crater lake in the Hakone area
Geologically, Ashinoko formed when eruptive activity blocked the flow of the Haya River and trapped water in the high valley, producing a lake that reaches around 724 m (2,375 ft) above sea level.formed at 724m above sea level The volcanic setting is still readable in the surrounding terrain, from sulphurous vents at ?wakudani to the line of younger cones that ring the water.
Water, shrine and old highway around Ashinoko
Ashinoko is strongly associated with Hakone Shrine, a Shinto shrine with a history dating back to 757, linked to the Buddhist priest Mangan and later to Minamoto no Yoritomo, founder of the Kamakura shogunate.Hakone Shrine dating back to 757 The shrine’s presence on the lakeshore ties religious practice directly to the landscape, and its red torii by the water has become one of the most recognisable elements of Hakone.
The shores of Ashinoko also carry the line of the former Hakone Checkpoint, a major inspection post on the T?kaid? highway established at the beginning of the Edo period under the Tokugawa shogunate.Hakone Checkpoint was set up at the beginning of the Edo period Rows of cedar trees follow the old road along the lakeside, giving a tangible sense of how coastal traffic once threaded through these mountains between Edo and Kyoto.
Ports, viewpoints and routes on and around the lake
Settlements such as Hakone?machi and Moto?Hakone line the southern shore of Ashinoko, with Togendai and Kojiri on the northern side providing further access to the water.Hakone-Machi and Moto-Hakone on the southern shores Sightseeing boats operate between these ports, connecting different parts of the lake and offering views of the surrounding mountains.
The lake sits within the Fuji?Hakone?Izu National Park, and nearby viewpoints include the Ashinoko?Hakone Skyline road that climbs above the water on the western side.Ashinoko-Hakone Skyline On clear days, the line of Mount Fuji appears beyond the lake, adding a further layer to the already complex volcanic landscape.
Visiting Ashinoko: what travellers from Western Europe should know
- Ashinoko lies in the Hakone region of Kanagawa Prefecture, south-west of Tokyo. It is reached by local rail and bus services via Odawara and Hakone?Yumoto stations.
- The lakeshore path around Hakone?machi and Moto?Hakone includes sections of uneven ground and old stone paving, and there are staircases leading up to Hakone Shrine in the forest.
- The lake sits at a moderate elevation within the mountains of the Fuji?Hakone?Izu National Park, and weather at Ashinoko can differ markedly from conditions on the coast.
- The official language is Japanese and the currency is the yen.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Ashinoko
Where is Ashinoko located?
Ashinoko is Lake Ashi in the Hakone region of Kanagawa Prefecture in Japan, lying within the Fuji?Hakone?Izu National Park.
What can visitors expect when they reach the lake?
Visitors encounter a volcanic lake ringed by forested slopes, small ports on the shores and access paths leading to Hakone Shrine and remnants of the old T?kaid? highway.
What makes Ashinoko distinctive among Japanese lakes?
Ashinoko combines a volcanic caldera setting, historical sites such as Hakone Shrine and Hakone Checkpoint, and established views towards Mount Fuji from its shores.
