geothermic
"This geothermal pool is located in the middle of a black lava field in northeast Iceland. The heated water comes directly from the Earth into the pool and contains numerous minerals and healing properties. Icelandic people soak in the pool under the rain and snow, socializing in the warmth of the water. The phenomenon of the geothermal pool is essential to the social and physical Icelandic landscape." - Carolyn Centeno via National Geographic