Niagara Falls (Cayuga: Gahnawehtaˀ or Tgahnawęhtaˀ ) is the collective name for the Horseshoe Falls and the adjacent American Falls along with the comparatively small Bridal Veil Falls. Located on the Niagara River which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in the world, with a vertical drop of more than 165 feet (50 m). Horseshoe Falls is the most powerful waterfall (vertical height along with flow rate) in North America. Niagara Falls forms the international border between the Canadian province of Ontario and the U.S. state of New York, also forming the southern end of the Niagara Gorge. The falls are located north-northwest of Buffalo, New York and south-southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.