A whirling current, also known as an EDDY, is a swirling flow of water or air that moves in a circular motion. Eddies are created when a larger current is disrupted by an obstacle, such as a rock or a tree. They can also form when two currents meet and interact. Eddies can be small or large, and they can last for a few seconds or several days. They can also move in different directions, depending on the strength of the current.