Owakudani: Hakone’s Volcanic Valley

Steam rising from the volcanic vents of Owakudani in Hakone

High above Lake Ashi, Owakudani is a rugged volcanic valley created by the eruption of Mount Hakone some 3,000 years ago. Today its barren slopes still hiss with sulphurous steam and bubbling hot springs, offering one of the most dramatic geothermal landscapes accessible near Tokyo. Reached by ropeway, it is a must-see stop on any Hakone loop.

Steaming Vents and Sulphur Springs

The name Owakudani means “Great Boiling Valley,” and the description fits. Vents in the hillside release plumes of white steam and the sharp scent of sulphur, while milky hot-spring pools simmer among the rocks. The active geothermal field is a vivid reminder that Hakone sits within a still-living volcanic system.

The Black Eggs (Kuro-tamago)

Owakudani’s most famous treat is kuro-tamago, eggs boiled in the valley’s sulphur-rich hot springs until their shells turn jet black. Local legend says eating one adds seven years to your life. Sold near the upper ropeway station, they are a quirky and popular souvenir of the visit.

Riding the Hakone Ropeway

The most scenic way to reach Owakudani is the Hakone Ropeway, which glides over the valley with sweeping views of the steaming earth below and, on clear days, Mount Fuji in the distance. The cable cars connect the geothermal area with Lake Ashi and the wider Hakone transport loop.

Visiting Safely

Because Owakudani is an active volcanic zone, sections may close temporarily when gas levels rise, so it is worth checking current conditions before you travel. When open, well-maintained viewpoints and walking paths let you take in the scenery comfortably. Combine it with a lake cruise and the open-air museum for a full day in Hakone.

Owakudani offers a rare chance to stand amid living volcanic terrain just hours from Tokyo. Between the steaming vents, the legendary black eggs, and the ropeway’s panoramic ride, it is one of the most memorable experiences the Hakone region has to offer.