The Blue Lagoon is the single most recognisable image in Icelandic tourism: milky blue water steaming in a black lava field, with people drifting around holding drinks and wearing white clay on their faces. It is also the attraction visitors argue about most. So here is the straight answer — it is genuinely impressive, it is expensive, it is not natural, and whether it belongs on your itinerary depends entirely on what you want from it.
What it actually is
The lagoon is a happy industrial accident. It sits beside the Svartsengi geothermal power station on the Reykjanes peninsula, and its water is superheated geothermal seawater that the plant has already used to generate electricity and heat. That water is rich in silica, which is what gives the lagoon its opaque blue-white colour and which seals the porous lava floor so the pool holds water at all. People began bathing in the runoff in the 1970s, a facility followed, and the whole thing grew from there.
It matters because the marketing occasionally implies a wild hot spring. It is not one. It is a very well-designed, very large man-made lagoon fed by a power plant, and it is renewed continuously rather than chemically treated.
What you get
The water sits around 38–39°C, warm enough to stay in for hours. Admission includes access to the lagoon, a silica mud mask from the floating bar, and use of the changing facilities; higher tiers add extra masks, a towel, a bathrobe and a drink. There is a swim-up bar, a steam room and sauna carved into the lava, and a waterfall you can stand under.
The setting deserves credit. Sitting in warm water in the middle of a moss-covered lava field, with steam rolling across the surface and Þorbjörn mountain in the background, is a genuinely memorable experience — particularly in winter, in the dark, with snow falling. Its location roughly 20 minutes from Keflavík airport also makes it the most practical first or last stop of a trip, and there is a luggage storage facility precisely because so many people use it that way.
The downsides
The price is the obvious one: it costs several times what any other geothermal bathing experience in Iceland costs, and the cheapest tier still is not cheap. Entry is timed and must be booked in advance — often well in advance in summer — so it does not accommodate spontaneity.
It is also busy. Even with capacity controls, the lagoon is rarely tranquil, and the "quiet corner" is a competitive sport. And the silica is genuinely harsh on hair: leave the conditioner they provide in for the whole soak, and tie long hair up out of the water unless you enjoy a week of straw.
One practical note that surprises visitors: as at every Icelandic pool, you are required to shower thoroughly without a swimsuit before entering. This is a public health rule, it is enforced by attendants, and it is not optional.
Check before you book
The Reykjanes peninsula has been volcanically active since 2021, with repeated eruptions in the Sundhnúkur crater row near Grindavík. The Blue Lagoon has closed temporarily on multiple occasions as a precaution and reopened once authorities cleared it. None of this makes a visit dangerous — Icelandic civil protection is extremely conservative — but it does mean you should check the lagoon’s own status page and safetravel.is close to your date, and buy a booking you can move.
Quieter alternatives
- Sky Lagoon in Kópavogur, minutes from central Reykjavík, with an infinity edge over the Atlantic and a seven-step bathing ritual. Comparable in price and polish, better ocean view, usually less frenetic.
- The Secret Lagoon (Gamla Laugin) in Flúðir, built around Iceland’s oldest swimming pool from 1891, sitting on the Golden Circle route with a small geyser erupting beside it. Far cheaper and considerably more low-key.
- Mývatn Nature Baths in the north — similar silica-blue water, a spectacular view over the lake district, and a fraction of the crowds.
- Krauma near Deildartunguhver in the west, fed by Europe’s most powerful hot spring, and the Forest Lagoon outside Akureyri, set in a birch wood above the fjord.
- Your local municipal pool. Every Icelandic town has one, entry costs a few euros, the hot pots are 38–42°C, and it is where Icelanders actually go.
Our take
Go once, if the budget has room and you can slot it against an airport transfer — the setting justifies the ticket at least one time. But do not let it be the only geothermal water you sit in. Iceland’s bathing culture lives in the neighbourhood pools and the roadside hot pots, and those will tell you far more about the country than the lagoon will.
Written by
Erika Sand
Erika has spent the last decade driving, hiking, and hot-spring-hopping across Iceland in every season. She writes NRF.is’s itineraries, guides, and trip reports to help travelers see the country safely, affordably, and without the tourist-trap detours.