Horseshoe Falls (Niagara Falls). Many people associate Niagara Falls with a single viewpoint. In reality, this place changes with every step. One moment you're standing right at the edge of the precipice, a few minutes later behind the curtain of water, or down by the river amidst rising spray. This is precisely what makes Horseshoe Falls so special. Horseshoe Falls is the largest of the three Niagara Falls and lies mostly in Canada. The horseshoe-shaped precipice is approximately 670 meters wide. About 90 percent of the total water of Niagara Falls flows right here. The water plunges an average of about 57 meters into the Niagara River, creating the enormous cloud of spray that is often visible from a considerable distance. The Journey Behind the Falls attraction leads through tunnels carved into the rock directly behind Horseshoe Falls. From there, you look through two openings directly at the cascading curtain of water. The elevator to the tunnel descends approximately 38 meters. From the viewing platforms, you feel the power of the water much more intensely than from the viewpoints above the falls. Directly above the edge of the falls lies Table Rock Centre. Few other freely accessible locations bring visitors closer to the start of Horseshoe Falls. A large portion of Niagara's water is used for controlled hydroelectric power generation. At the same time, international agreements ensure that sufficient water flows over the falls to preserve their appearance. The edge of the falls has been slowly migrating upstream since the end of the last Ice Age. Targeted engineering measures have significantly slowed this natural erosion.