It's difficult to say definitively which waterfall is the "most powerful" in the world, as there are different ways to measure power.

Here are some contenders, depending on how you define power:

* Highest flow rate: The Kaieteur Falls in Guyana is often considered the most powerful in terms of flow rate, with an average flow of 663 cubic meters per second. It's a single-drop waterfall with a drop of 226 meters (741 feet).

* Highest overall volume: The Iguazu Falls on the border of Argentina and Brazil have a much higher total volume of water flowing over them, but it is distributed over many individual drops. It's arguably the most impressive in terms of sheer visual scale.

* Highest drop: The Angel Falls in Venezuela is the tallest waterfall in the world, with a drop of 979 meters (3,212 feet). While its volume is lower than Kaieteur Falls, its sheer height makes it quite powerful.

Ultimately, the "most powerful" waterfall is a matter of opinion and how you prioritize factors like flow rate, volume, and height.