相玉地区4源泉・河内地区5源泉・蓮台寺地区2源泉・大沢地区2源泉・下田地区2源泉 計15源泉による混合泉
Hamabe-no-Yu Blended Source (15 wells across Aitama, Kawachi, Rendaiji, Osawa and Shimoda)Operated by · 浜辺の湯 下田荘
Mixed source
Sampled at mixing tank
湯
Simple
A hot (53.3 °C) blended source pooling 15 wells from five Shimoda-area districts (Aitama, Kawachi, Rendaiji, Osawa and Shimoda), classified as a simple thermal spring with a quiet, well-balanced composition. The water is weakly alkaline (pH 8.1) and soft on the skin, sitting on the edge of Japan's beauty-water family. Lightly mineralized overall at 814 mg/kg, but a notable 346.5 mg/kg of sulfate — backed by 118.9 mg/kg of chloride — gives the bath more body than the simple-thermal label suggests.
Source temperature
53.3°C
Hot
Tonicity
0.81g/kg
Hypotonic
Free CO₂
4.40mg/kg
Low
Cert no. 賀保衛 第12号