Overview
About Blue Lagoon
An unexpected industrial landscape
The lagoon developed during the 1970s when water released by the Svartsengi geothermal power station accumulated in the surrounding lava. The water was expected to drain through the porous rock. Instead, silica deposits restricted drainage, allowing a reservoir to form. Its origin therefore differs from that of a naturally occurring hot spring or volcanic crater lake.
Minerals and colour
The geothermal fluid contains seawater and freshwater that have circulated deep underground. Silica particles scatter light and contribute to the lagoon's milky blue appearance. As the water cools, silica also forms the white deposits associated with the lagoon; sunlight and viewing conditions alter its apparent colour.
From reservoir to bathing site
Bathing began in 1981, and changing facilities followed in 1987. The Blue Lagoon company was established in 1992. A relocated spa opened in 1999, marking the transformation of an accidental reservoir into a purpose-built visitor facility.
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