Back Estany solar Catalan Solar Pond German Estanque solar Spanish برکه خورشیدی FA Étang solaire French Estanque solar GL בריכת שמש HE Sunčevo jezerce Croatian ソーラーポンド Japanese Staw słoneczny Polish
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A solar pond is a pool of saltwater which collects and stores solar thermal energy. The saltwater naturally forms a vertical salinity gradient also known as a "halocline", in which low-salinity water floats on top of high-salinity water. The layers of salt solutions increase in concentration (and therefore density) with depth. Below a certain depth, the solution has a uniformly high salt concentration.