This geothermal pool is about a size of jacuzzi for 4 to 6 people, so nothing big. There is an another hotpot under this one about the same size, just with colder water.
How to find the Krosslaug Reykir geothermal pool:
Krosslaug Reykir is along the road nr. 52. After you park your car at this parking lot (GPS: 64.504125, -21.203828), just go through the gate, keep the left and about approx. 100 m/yd you are there.
GPS coordinates of Krosslaug Reykir Natural Geothermal pools : 64.504921, -21.204791 Take me there!
Photos of the Krosslaug Reykir natural Geothermal pool: