Niagara Falls—Between the U.S. and Canada

Straddling the U.S.-Canada border, Niagara Falls is home to some of the best known waterfalls on Earth. Formed by receding glaciers at the end of the last ice age, this natural wonder is composed of three separate falls: Horseshoe Falls (which is the largest and most powerful of the three), the American Falls and Bridal Veil Falls. Horseshoe Falls is the most powerful waterfall on the continent.