Izusan Onsen
- Location
- Atami, Shizuoka Prefecture, Japan
- Water type
- sodium chloride
- Temperature
- 41 °C
- pH
- 7.3
Water profile
Relaxing — deep, immediate muscle release.
Loaded with major ions — the essential minerals (Ca, Mg).
Dense, salty water — you float without effort.
Izusan Onsen is a historic hot spring district in Atami City, Shizuoka Prefecture on the Izu Peninsula, one of the oldest known hot springs in the region, with traditions reaching back more than a thousand years to the time when the spring was revered as a sacred site associated with the Izusan Shrine. The Izusan Shrine, dedicated to the deity of the hot spring, has been a place of worship since ancient times and attracted visits from powerful historical figures including the shogun Minamoto no Yoritomo, who prayed here before his decisive campaigns that established the Kamakura shogunate in 1185. Atami is today one of the most visited onsen resort cities in Japan, and Izusan Onsen within it preserves this ancient tradition of sacred bathing at a spring whose history encompasses both the spiritual and therapeutic dimensions of Japanese hot spring culture.