Ōwakudani (大涌谷) — Hakone 大涌谷
You can only walk among the vents with a guide: 700 m, four slots, 30 places, 800 yen.
Formed by an eruption about 3,000 years ago, it still vents fumaroles of hydrogen sulphide, with dead trees left standing and the clay-altered rock that gives the slope its reddish-brown colour; you can smell the sulphur from far away. About 2.5 km from Lake Ashi, and on the map for the same story arc: you visit them on the same outing. Address 足柄下郡箱根町仙石原1251.
Kanagawa
上湯, 姥子, 姥子中
Dr. Stone
The volcanic valley where Senku, Taiju and Yuzuriha go to collect sulphur to make gunpowder: it is the model for the Hakone volcanic area in the series.
