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South Africa Bourke's Luck Potholes - Blyde River The Blyde River Canyon is a significant natural feature of South Africa, located in Mpumalanga, and forming the northern part of the Drakensberg escarpment. It is 26 kilometers in length and about 800 meters deep, mostly consisting of red sandstone. It is the third largest canyon in the world. It is known as one of the great wonders of nature in Africa.