Soak in this broad, calm geothermal pool, mist rising and ringed by natural rocks. The walking trail along the edge of this lovely hot spring passes the local river and a series of sizzling vents and geysers. Surrounding meadows fill with wildflowers in summer. Increasingly popular, the lagoon gets packed with tour-bus crowds in mid-afternoon, so come earlier or later.
Swimsuit and towel rental are 500kr each. There's also an on-site coffee shop and fish and chip food truck outside. Find the lagoon signposted on the northern bank of the river Litla-Laxá in Flúðir.