Owakudani - 大涌谷

Up for tasting some Sulfur-flavored black boiled eggs in a dangerous active volcanic zone where sulfurous fumes, hot springs and hot rivers can be experienced?

If yes, come to Owakudani, an area around a crater created during the last eruption of Mount Hakone several thousands of years ago. Aptly, Owakudani is called the ‘Great Boiling Valley’. Its last volcanic explosion was so powerful that the area is still active with boiling pools of water and huge vents that expel steam and volcanic fumes of sulfur dioxide and hydrogen sulfide. It may sound intimidating but it is, in fact, a popular tourist attraction that is visited by thousands of people each year who come for the mystical black boiled eggs, locally known as ‘Kuro-Tamago’.

These are actually just plain chicken eggs but their strange black hue comes from boiling them in the sulfur-rich hot water pools. The sulfur in the water reacts with the eggs’ shells, making them black and giving the white and yellow inside a sulfur flavor.

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