The "strongest" waterfall in the world is usually measured by the average annual flow rate, and that title belongs to the Boyoma Falls (formerly Stanley Falls) in the Democratic Republic of the Congo. Boyoma Falls consists of seven cataracts that drop across the Lualaba River. It has an incredible flow rate of approximately 17,000 cubic meters per second (600,000 cubic feet per second). In terms of a single, massive "curtain" of water, Niagara Falls is often cited as the strongest in North America, while Victoria Falls in Africa is renowned for the largest "sheet" of falling water. However, if you are looking for the most "powerful" in terms of concentrated force in a single drop, Inga Falls, also in the Congo, is technically a series of rapids but has a staggering volume that surpasses almost any traditional vertical waterfall. These sites are not just natural wonders; they represent the most significant untapped sources of hydroelectric potential on the planet due to the sheer kinetic energy of the moving water.