[9] Soon after World War II, the Odakyu Electric Railway was completed as far as Hakone Yumoto Station, making it very convenient for people from the Tokyo metro area to visit this resort.

[10] In 1935 the Seibu Railway also began rail service to Odawara, and regular buses took passengers the remaining 6 kilometres (3.7 mi) to Hakone.

[11] When volcanic earthquakes increased around Mount Hakone in April 2015, the Japan Meteorological Agency placed that area on a Level 2 Alert, adversely impacted local tourism.

This area is known for its clear, alkaline waters and according to legend, it was discovered in 1604 by a Buddhist priest, who reputedly used it to help heal the sick.

[15] Miyanoshita Onsen is a small cluster of hot spring facilities just two stops west of Tōnosawa Station on the Hakone Tozan Railway.

The Fujiya Hotel and Ginyu Ryokan are both renown in this area and some of the springs feature salt water, which is said to be effective for some ailments.

Allegedly discovered by the 14th century zen master Musō Soseki at the bottom of a valley, two hotels exist in this area that are accessible by private monorail cable cars and ropeways.

This legend suggests the white fox that led Yoritomo became his wife and was later enshrined as the fox-god Inari after his death.

[21] Ohiradai Onsen is a hot spring facility located near Ōhiradai Station on the Hakone Tozan Railway that opened in 1951.

[23] Ni-no-taira Onsen is a slightly alkaline hot spring at an elevation of 550 metres (1,800 ft) that opened in 1953 near Chōkoku-no-mori Station on the Hakone Tozan Railway.

On a clear day, it affords a splendid view of the Sagami Bay and this onsen is located within walking distance to the Hakone Open-Air Museum.

Its waters are rich in calcium sulfate and the Hakone Tozan Bus offers regular service to this area.

Literally known as "hot spring flowers" (yunohana) in Japanese, they are rich in sulfur, calcium, aluminium, iron, and silicon.

Facing Lake Ashi, this hot spring facility boasts several resorts and its waters are rich in calcium sulfate.

Kojiri Onsen is a hot spring developed after the 1960s on the northern shore of Lake Ashi around Tōgendai Station on the Hakone Ropeway.