The mighty Congo River drains half of central Africa, but curves around, avoiding major falls along its whole length except, as it is about to enter the Atlantic Ocean. 

And this fall is very unimpressive, merely 96 meters, but it has a flow of 42,5 cubic meters per second.

Editor's Note: When next you drive towards Hermanus, notice the wind farm on the horizon from the top of the last hill before Arabella Golf estate (http://www.biothermenergy.com/dassieklip). 'Green' energy is a hot topic these days. Peter wrote this very interesting article with regards to hydro electricity. Download it in PDF format here.