Grænavatn
Grænavatn (Green Lake) is a volcanic crater that got its name from its unusual green colour. The colour is due to a high level of sulphur in the water and the depth. The lake is only about few hundred meters in diameter and offers a perfect trail for a refreshing walk, as it only takes about 20 minutes to walk around the lake. For a small lake it is quite deep, about 45 meters. This is visible as you stand by the brim, and you can see how the colour changes from by the shoreline to where the lake gets deeper. Grænavatn is considered by geologists to be one of the most noteworthy geological phenomena of its kind in Iceland. (Seltún, Iceland)
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