Blyde River Canyon. The Three Rondavels are seen to the right of the center of this view.

While it is difficult to compare canyons world-wide, Blyde River Canyon is one of the largest canyons on Earth, and it may be the largest 'green canyon' due to its lush subtropical foliage. It has some of the deepest precipitious cliffs of any canyon on the planet. It is the second largest canyon in Africa, after the Fish River Canyon, and is known as one of the great wonders of nature on the continent.

• http://en.wikipedia.org/wiki/Blyde River Canyon
• Hillman 1000 Wonders