Hrunalaug is near Fludir on the south-west corner of Iceland. There are two pools, one made of concrete and the other one is a rock wall. Both of them are warm and clean. The concrete one is a small on and only fits about 3 people the other one is a bit bigger. There are ruins of an old locker-room witch can be used to change.
source : http://www.kjoarnir.is/index.php/photography/hotspringiceland/item/230-hrunalaug/230-hrunalaug