Gamla laugin- The Secret Lagoon.
The Secret Lagoon is located in Hverahólmar in the village Flúðir. It has been connected to the Golden Circle since the new bridge over Hvítá was opened. It is a man-made pool with geothermal water, surrounded by many natural hot springs. Amongst them is a small hot spring called Little Geysir, which spouts every few minutes. The temperature of the water in the Secret Lagoon is 38-40 degrees C.
GPS: 64.137632, -20.309054