Reversing Falls is a natural phenomenon located in Saint John, New Brunswick, Canada. It occurs where the Saint John River meets the Bay of Fundy, known for having the highest tides in the world. As the tide rises, ocean water flows upstream into the river, creating a unique reversal of currents. This event can be observed during high tide, when the water level in the bay rises significantly. The powerful currents and swirling waters attract visitors and are a popular spot for sightseeing and photography. The area also offers various recreational activities, including kayaking and boat tours.