It is not the biggest man-made waterfall in the world. The biggest man-made waterfall in the world is the Cascata delle Marmore, located in Umbria, Italy. It's 165 meters, or 541 feet, tall, and was created by the ancient Romans.
The Tugela Falls located on the Tugela river in South Africa is the highest waterfall on the African continent and also the second highest in the world. The Victoria Falls located on the Zambezi river between Zambia and Zimbabwe is considered the biggest waterfall in the world.