Iceland is located on a Hot Spot, resulting in a lot of geothermal activity, hot springs and natural baths everywhere you go! Some of them are boiling hot, like the hot springs in the geothermal area Haukadalur but others are perfect to bath in.
The most popular nature baths in Iceland are the Blue Lagoon on the Reykjanes peninsula, Reykjadalur geothermal area near Hveragerði, the Secret Lagoon in Flúðir, Seljavallalaug in South Iceland, Landmannalaugar in the highlands and Mývatn Nature Baths in North Iceland.