Running the largest canyon in Africa:
"Ryan Sandes, a South African Ultra-Runner, as he returns to the Fish River Canyon to run the 5 day, 84km, Fish River Canyon Hiking Trail in the fastest time possible. He completed the run, self-supported, in amazing time of 6h57min!"
The best running part starts at 3:20 into the video.
The Beauty of the Irrational from The African Attachment on Vimeo.