Japanese Bathhouse: 01 Onsen

An (温泉) is a Japanese hot spring that serves as a cornerstone of Japanese culture, valued for its therapeutic minerals, relaxation, and deep historical roots. Legally defined by its natural geothermal origin and specific mineral content, an onsen is distinguished from a sento , which is a public bathhouse typically using heated tap water. The Onsen Experience: Essential Etiquette

The most critical aspect of visiting an onsen is following the established "naked truth" (hadaka no tsukiai) philosophy, where social hierarchies dissolve in a communal space.

The History of Japanese Onsen: Bathe a Modern Interpretation