Grænavatn or 'Green Lake' is a small lake south of Seltún.

This lake got its name from its unique green colour. The colour comes from a high level of sulphur within the water. The lake is rather small, and should take around 20 minutes to walk around. However, for a small the lake the depth is unusually deep: Roughly around 45 metres. The lake is the subject of folklore stories, including in the 16th century a strange creature was seen leaving the lake! Spooky!

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