Niagara Falls, located at the junction of Canada and the United States, is the world's first large-span waterfall. Niagara Falls originates from the Niagara River, with an average flow of 2,407 cubic meters per second. The main waterfall is located in Canada and resembles a horseshoe. It is the best place to watch the waterfall. The Niagara River flows down the cliff and converges downstream. It falls 15.8 metres at a speed of 35.4 kilometres per hour in less than 2 kilometres. It passes through Queenston, Canada, on the left bank, and Leviston, the United States on the right bank, through the Devil's Hole Jet, and enters Lake Ontario from west to east along the last Leviston tributary canyon. Niagara Falls, Iguazu Falls and Victoria Falls are called the world's three large-span national waterfalls.