Loaded with major ions — the essential minerals (Ca, Mg).
Buoyancy
Effortless float
LowHigh
Dense, salty water — you float without effort.
SodiumChloruresBrome
Hanareyama Onsen Fukuchiyama is a natural hot spring in Fukuchiyama, a city in northern Kyoto Prefecture, Japan, a historic castle town whose Fukuchiyama Castle was originally built by Akechi Mitsuhide — the feudal lord who betrayed and killed Oda Nobunaga at the Honnōji Incident in 1582, one of Japanese history's most dramatic turning points — and whose ruins and reconstruction overlook this important northern Kyoto junction city. The naturally chloride-sodium spring waters here provide a warming, saline mineral soak valued for circulation improvement and skin nourishment, offering visitors and residents of this historically significant castle town a restorative wellness experience. The combination of dramatic Sengoku period history, Fukuchiyama Castle's distinctive presence, and the everyday comfort of local chloride hot spring bathing makes Hanareyama Onsen a quietly satisfying thermal destination in Kyoto Prefecture's underexplored northern reaches.
Insider tip — Hanareyama Onsen in the Fukuchiyama basin of northern Kyoto prefecture draws sodium-chloride hot spring water at a robust 44°C from deep sedimentary formations beneath the Yura River plain. The city of Fukuchiyama is a castle town and regional rail junction, making this onsen easily reachable from both Kyoto and the San-in coast. The high temperature and salt content make it excellent for relieving muscle fatigue — a single long soak is typically sufficient. The surrounding Tanba highlands produce excellent black soybeans and chestnuts available at local roadside stalls in autumn.