Haida eddies are swirling waves of ocean water (like in a swimming pool when you drop a rock in it) that form off the coast of Haida Gwaii, in British Columbia, Canada. These eddies are caused by the interaction between the warm water coming in from the Pacific Ocean and the cold water coming down from the north coast of Canada. The eddies produce strong currents which can last for days or months. As the eddies move around, they affect the movement of fish and other sea creatures. They also cause cooler temperatures in the surrounding water, which can help keep fish and other sea creatures healthy. Haida eddies are important to the ecology of the region, helping to keep the ocean balanced.