1. Niagara Falls: Located on the border of the United States and Canada, Niagara Falls is one of the most famous and powerful waterfalls in the world. It consists of three separate falls: Horseshoe Falls, American Falls, and Bridal Veil Falls.
2. Iguazu Falls: Located in the Iguazu National Park on the border of Argentina and Brazil, Iguazu Falls is a complex of waterfalls that span over 2.7 kilometers (1.7 miles). It is considered one of the most impressive natural wonders of the world and is surrounded by lush subtropical rainforest.