Mt. Tanzawa with an altitude of 1567 m is on the border of Sagamihara City, Kiyokawa-mura in Aiko-gun and Yamakita-cho in Ashigara-Kami-gun in Kanagawa Prefecture. It is a part of the Tanzawa Shumyaku (the great ridge) and a part of Tanzawa-Oyama Quasi-National Park. Being close to Tokyo metropolitan area, Mt. Tanzawa is thronged with hikers all through the year.

It is said that “Mt. Tanzawa” on the list of “Japan’s 100 Fine Mountains” includes not only Mt. Tanzawa but also other mountains rising in the central part of the Tanzawa mountain range, which used to be generically called “Tanzawa-san.” However, in the Meiji period (1868-1912), when a land survey was conducted, the triangulation point was placed at this mountain peak and the mountain was tentatively named Mt. Tanzawa. In time, people began to call this mountain alone “Mt. Tanzawa.”

The mountain is covered with the flowers of Yamazakura (Prunus jamasakura), Mitsuba-tsutsuji (Rhododendron dilatatum), Yamatsutsuji (Rhododendrom　obtusum) and Shiroyashio (Rhododendron quinquefolium) in spring, Gakuutsugi (Hydrangea scandens), Japanese dogwood, Kobaikeisou (Veratrum stamineum), Yamayuri (Lilium auratumand) and lespedeza in the early summer, and autumn leaves in fall.