Kaieteur Falls, Guyana

Kaieteur Falls on the Potaro River in Guyana is the world's most powerful waterfall by the measure of flow rate per unit width, dropping 226 metres in a single unbroken plunge — nearly five times the height of Niagara — over a ledge 113 metres wide, with an average flow of 663 cubic metres per second. Sitting deep in the Kaieteur National Park, it remains one of the world's most isolated major waterfalls, surrounded by pristine primary rainforest that is home to the rare Guiana cock-of-the-rock and the golden rocket frog. Access is almost exclusively by small charter aircraft from Georgetown, which makes the trip expensive but also guarantees an uncrowded, genuinely wild experience.