Brimketill lava rock pool, located on the Reykjanes Peninsula in Iceland, is a unique coastal rock pool with a fascinating folklore backstory. Legend has it that it was once used by a giantess named Oddný for bathing and washing her clothes. The pool's basin-like shape was formed by coastal erosion from powerful waves crashing against the rocks. While it may look inviting in photos, it's not recommended to swim in due to sharp, slippery rocks and unpredictable weather conditions.