Niagara Falls has moved back seven miles in 12,500 years and may be the fastest moving waterfalls in the world.

While "fastest" can be measured by flow rate or the physical speed of the water, Niagara Falls is widely cited as the fastest-moving waterfall in the world in terms of the velocity of the water at the crest. As the water from the Great Lakes funnels into the Niagara River, it reaches speeds of up to 68 miles per hour (109 km/h) as it drops over the Horseshoe Falls. This extreme speed is a result of the sheer volume of water—about 700,000 gallons per second—combined with the steep 188-foot drop. In 2026, while the Inge waterfalls in the Congo River have a higher "volume" of water moving through them (making them the largest by flow), Niagara remains the standard for "velocity" because of its vertical drop. This immense kinetic energy is why Niagara is also a massive source of hydroelectric power. For visitors, this speed creates the "thunderous" sound and the permanent mist cloud that characterizes the site, a physical demonstration of the raw power of hydraulic force as it moves toward the Atlantic Ocean.