Rich in active gases or metals — a strong mineral character.
Buoyancy
Standard buoyancy
LowHigh
Soft water — natural, classic buoyancy.
FerBicarbonatesManganèse
A traditional onsen experience involves immersing oneself in serene, natural hot spring baths, surrounded by tranquil surroundings. Guests typically follow a set of cultural etiquette rules, including removing shoes before entering, washing thoroughly before bathing, and following designated bathing areas. The bathing tradition emphasizes relaxation, serenity, and respect for the natural environment. Guests are often required to wear minimal attire, and personal grooming is typically done in designated areas. The experience is meant to promote a sense of calm and well-being, allowing individuals to unwind and rejuvenate.
Insider tip — Kojohama Onsen Hana no Yu sits on the Pacific coast of Hokkaido's Hidaka subprefecture, drawing iron-rich waters from coastal thermal veins with a distinctly briny marine edge. The facility commands sweeping views over Uchiura Bay and on clear days Mount Komagatake volcano is visible across the water. The iron content gives the water a warm amber colour and the baths are prized for relieving fatigue after surf fishing or coastal hiking. Early morning bathers are occasionally rewarded with Pacific sunrises viewed directly from the rotenburo.
