This is the oldest geothermal swimming pool in Iceland! The Secret Lagoon is a natural hot spring located in a small village in the south. Steam rises from the surrounding geothermal area which gives the lagoon a magical air like something from your childhood fairy tales. The water is warm enough to bath in, around 38-40 degrees Celsius and there is even a little Geysir which erupts every 5 minutes, showing off while you guys relax in the hot spring.