Forest Lagoon is a geothermal spa in the Vaðlaskógur forest, just outside Akureyri in North Iceland.

It overlooks the Eyjafjörður fjord and features warm geothermal pools, a swim-up bar, a cold plunge, a sauna, and an onsite bistro.

Since September 2025, the pools have been expanded to nearly 1,200 m2.

The water stays between 37–39°C, depending on the weather, so you can enjoy a comfortable soak year-round.