Owakudani volcanic vents

Owakudani — the “Great Boiling Valley” — is the visible scar of the steam explosion 3,000 years ago that also created Lake Ashinoko down the slope. White sulfur smoke rises continuously from vents in red clay; the smell of rotten eggs is pervasive. The ropeway from Sounzan crosses directly over the vent field before landing at the station, which is the best vantage on the geology.

The headline souvenir is the kuro-tamago: ordinary chicken eggs boiled in iron-sulfide ponds until the shells turn jet black. They’re sold in fives, and folklore says one egg adds seven years to your life. Buy a packet for the experience, not for lunch.

The station and short walking course can run on a 30-45 minute visit. The longer trail toward the actual ponds is closed to the public on most days for safety. Operations pause whenever volcanic activity ticks up, sometimes for weeks at a time, and the ropeway routes around the closure with a substitute bus — confirm before committing the day to it.

The short walking trail from the ropeway station into the active volcanic zone takes about 30 minutes total and leads to several steam vents and bubbling pools. As of recent updates, admission to this trail requires advance reservations at hakone.or.jp and costs 800 yen — check before assuming walk-up access. The more adventurous hiking trail that continues to Mount Kamiyama’s peak and onward to Komagatake remains closed due to volcanic activity concerns; do not attempt it without current clearance from the Hakone volcano monitoring authority.

For a more ambitious route when the upper trails are open: from Owakudani a path splits toward Lake Ashinoko, descending the mountain and ending at Kojiri near Togendai in approximately 4.5 hours round-trip. This is a backcountry option, not the standard tourist course, and requires proper footwear and weather awareness. The standard visitor experience — ropeway, short trail, eggs, views — takes under an hour.

On clear days, the Fuji view from Owakudani is among the best in the Hakone area — the mountain rises directly behind the barren, sulfur-stained landscape, and the contrast between white peak and red clay is striking. The ropeway ride from Sounzan is itself the most dramatic approach: the gondola crosses directly over the vent field, and the sulfur smell enters the cabin before you land. Sounzan is accessible from Hakone-Yumoto via the Hakone Tozan Railway and cablecar, with a transfer at Gora Station. Togendai, the ropeway’s other terminus, connects to the Lake Ashi sightseeing boats, making Owakudani a natural midpoint on the classic Hakone loop circuit.