Owakudani Valley is a volcanic valley located in the Hakone area of Japan. It was formed by the eruption of Mount Hakone around 3,000 years ago. The valley is known for its active geothermal features, including hot springs, sulfur vents, and bubbling mud pools. Visitors can enjoy scenic views of the surrounding mountains and the iconic Mount Fuji on clear days. The area is also famous for its black eggs, which are boiled in the hot springs and turn black due to the sulfur. Eating these eggs is said to add seven years to one's life. Owakudani Valley is accessible via the Hakone Ropeway, making it a popular destination for tourists.