The crator, which was formed in the last vaporous eruption of the Hakone mountains when the highest mountain in Hakone, Mt.Kami erupted 3000 years ago, has spouted out hot vapor and sulfide to this day. Once known as Oojigoku("hell"), or grand hell, it was renamed "Oowakudani" before the Meiji emperor's visit in 1876 since it was not a good for the Emperor to visit a place called "hell". The grand view of Mt.fuji can be enjoyed from this spot. (50 scenic areas in Kanagawa)

Lava from the crator of Mt. Kami divided Lake Ashi into two, the south half staying as Lake Ashi and the other half becoming a marshy region. Such rare marshy plants as nohanashobu and mizugoke form communities there, and a part of the region was designated as natural monument in 1934. (50 scenic areas in Kanagawa)

Lake Ashi, 20km in circumference, is a slender lake formed in the Hakone caldera some 400 thousand years ago. The inverted reflection of Mt. Fuji viewed through the pine avenue in the southern shore is picturesque scenery. Lake Ashi abundant in pond smelt, trout, black bass and other kinds of fish, many people enjoy fishing there.

Mt. Komagatake, a peak of the central crator hill in the middle of the Hakone caldera, is 1357m high. The panoramic view including Mt. Fuji, Lake Ashi and the mountains surrounding the caldera from the summit, which is a gentle prairie, is just breathtaking.

Mt. Kintoki, having a height of 1213m, used to be called Mt. Inohana. On the foot of the mountain exist many ruins of the famous Japanese "Kintaro" legend, including Kintoki Shrine where Kintoki Sakata is deified.