Stóragjá is a cave with a thermal pond, located not far from its more famous counterpart, Grjótagjá (made popular by the TV series Game of Thrones). The access is somewhat more complicated, and if you want to take a dip, you’ll need to rappel down using a rope found at the cave’s entrance. Unlike Grjótagjá, however, you can actually swim here.
From the road, follow the pedestrian path. After about two hundred meters, you will see metal stairs. Descend these to reach the Stóragjá pond.
