The Blue Lagoon (Blàa Lonith)

The Blue Lagoon is a terribly overpriced but fabulous geothermal bathing pool.  The water is milky blue - where the runoff is less disturbed it is bluer and less milky.  The bottom of the pool is mostly sandy; the sides are smooth white silica deposits over lava rock, which would otherwise be sharp and black.

 

There are pots of silica mud, which you can use to give yourself a facial.  It leaves your skin soft, but we found the the water leaves your hair feeling awful - kind of wooly, like an Icelandic sheep.

Outside the spa, the undisturbed water is bluer

Moss growing on lava rock. You see this all over where there is lava rock.  There are signs telling you not to walk on it.