American Falls + Horseshoe Falls = Niagara Falls

Niagara Falls is the collective name for three waterfalls on the Niagara River: American Falls (U.S. side), Horseshoe Falls (Canadian side, largest), and the smaller Bridal Veil Falls. Together they form the world's highest-flow waterfall system, straddling the NY–Ontario border. Horseshoe Falls carries ~90% of the flow; American Falls ~10%. The name "Niagara" comes from the Iroquoian *Onguiaahra* ("the strait").