The Blue Lagoon is one of Iceland’s most iconic experiences — but its origin story is more recent (and more accidental) than most visitors realize.
The lagoon unintentionally formed in 1976 when a nearby geothermal power plant released excess water into a lava field. Over time, the water became rich in minerals like silica, algae, and other natural elements, turning it into the unique, milky-blue geothermal spa now known as the Blue Lagoon.
Why the water glows that colour
Silica is the main reason the lagoon looks the way it does. Suspended in the water, it scatters daylight into a soft, diffused blue — particularly when the sky above turns grey and the surrounding lava fields blacken with rain.
“Each day here is filled with new wonder.”
What it feels like to be in
The water sits at a constant 37–40 °C. The mineral content is gentle on most skin types and many guests apply silica or algae masks at the in-water bar. The lagoon itself is large enough that, even on a busy day, you can find a quiet corner against the lava cliffs.
Three things to know before you go
- Bookings are timed — entry is staggered to keep the lagoon comfortable.
- Silver and copper jewellery can tarnish in the mineral-rich water.
- The lagoon sits between Keflavík airport and Reykjavík — perfect for arrival or departure day.
How Around Iceland helps
We can wrap the Blue Lagoon into a transfer from the airport, a Golden Circle day, or a multi-day Ring Road journey. Our team handles bookings, transportation, dining and lodging — so you can focus on the soak.