It is very dangerous to swim at Reynisfjara.
That’s because the sea here is highly unpredictable. Sneaker waves are common—i.e. rogue waves that are much stronger than typical waves and that can appear to come out of nowhere. Visitors have been knocked off their feet and dragged out to sea. Some of them have died.
So, please don’t swim at Reynisfjara. Apart from being very wild, the sea is also extremely cold.