Hellulaug was our favourite Icelandic thermal pool. We bathed (twice) in sunshine and admired the oystercatchers, terns and ducks in the sea beneath us.
It is deep in the stunning, but remote Western Fjords 500 meters from the hamlet of Flokalundar which has a nice hotel serving guillemot (bit weird) and minke whale (rather good). It is called after the viking who first named the country in 865. The story says he climbed the local hill and saw a fjord full of icebergs. Hence, ‘Iceland’.
If he’d bathed here he might have called it ‘warmland’.
A guide to hot springs in this part of Iceland here