Shirada Onsen

Shirada Onsen in Higashiizu Town, Shizuoka Prefecture is located on the eastern coast of the Izu Peninsula, where it contributes to the remarkable concentration of thermal springs scattered along this geologically active volcanic coastline, and is distinguished by an unusual phonetic characteristic: while the standard reading of its characters might suggest the unvoiced pronunciation shirata, the official pronunciation is the voiced shirada with a voiced consonant, a precision acknowledged on the spring's official website. The spring flows with siliceous, sulfate, and calcareous thermal waters, a triple mineral composition that reflects the geological complexity of the Izu Peninsula's coastal volcanic environment where multiple mineral-bearing rock formations intersect before their thermal water reaches the surface. Shirada Onsen's three-mineral water profile and its careful attention to the precise pronunciation of its own name connect it to the tradition of Japanese onsen culture's meticulous documentation of both the geological character of spring water and the exact linguistic identity of each thermal destination within Japan's extraordinarily detailed hot spring geography.