The capaill uisce, also known as the water horse, is a creature from Irish folklore. It is often depicted as a horse that can transform into a water-dwelling being, typically associated with lakes and rivers. Legends describe it as both beautiful and dangerous, luring unsuspecting travelers to ride it before dragging them underwater. In some stories, the capaill uisce is said to have a mane made of seaweed and can create powerful waves. It is a symbol of the untamed forces of nature and serves as a cautionary tale about the dangers of the water.