These are two man made rock pools built over a hot spring at Reykir, close to the town of Sauðarkrókur in North Iceland. The pools are constructed from natural stones. The older pool is called Grettislaug, after Grettir Ásmundarson the Strong. According to Grettis Saga Ásmundarsonar, one of the Icelandic sagas, Grettir bathed in in the pool to warm himself after swimming 7 km in the sea from Drangey Island. Grettislaug is still used for bathing today, the temperature is about 40° Celsius. A Camping site and small service facility is next the pool, and is open during the summertime.
Parking lot GPS: 65.881378, -19.736671