Owakudani

Owakudani, or the Great Boiling Valley, is a volcanic valley in the Hakone area of Kanagawa Prefecture, Japan. It lies within the Fuji-Hakone-Izu National Park and sits on the rim of the Hakone caldera, formed by the region’s ongoing volcanic activity. The landscape is marked by active fumaroles, sulfur vents, hot springs and steam pools, with views toward Lake Ashi on clear days.

The site is equipped with wooden walkways and observation points around the vents. It is commonly reached by the Hakone Ropeway, which runs from Sounzan to Togendai with a stop near Owakudani; a short walk from the station brings visitors to the sulfur vents and viewpoints from which the crater-like scenery can be observed.

The area is known for kuro-tamago, eggs boiled in the sulfurous hot springs until the shells turn black. Eating one egg is part of the visitor experience, and folklore says it adds seven years to life, though there is no scientific basis.

Volcanic gas and high temperatures mean areas are restricted to designated paths, and occasional closures occur during heightened volcanic activity or gas emissions. Visitors should follow warnings from park authorities and enjoy the site from the designated viewpoints.

Nearby attractions include Lake Ashi and Mount Hakone, which provide complementary scenery and tours.