Owakudani (大涌谷, Ōwakudani) is the area around a crater created during the last eruption of Mount Hakone some 3000 years ago. Today, much of the area is an active volcanic zone where sulfurous fumes, hot springs and hot rivers can be experienced. Additionally, Owakudani has good views of Mount Fuji on clear days.
A short walking trail (about ten minutes one way) leads from the ropeway station into the volcanic zone to a number of steam vents and bubbling pools. Here you can purchase eggs, cooked in the naturally hot water, whose shells are blackened by the sulfur and which are said to prolong one's life by seven years.