Grand Canyon is the most recognisable canyon system

Location: Grand Canyon, USA (36.05335° N, 112.08344° W)
Date: 5 September 2006; 8.35am
Camera: Canon EOS 300D with Sigma 70-200/f2.8

The Grand Canyon must be one of the most recognisable canyon systems in the world. Though it is mo longer "the most" in many perspectives, it is still used as a yardstick for comparison purposes when other canyons are mentioned. For example, I often read that the Yarlung Tsangpo (deepest canyons in the world) is how many times deeper than the Grand Canyon and the longest canyon system, the Nujiang Gorge is how many times the total length of the Grand Canyon etc etc. I guess one of the reasons has to be the Western world is more familiar with the Grand Canyon and so using it as a comparison gives the readers both a sense of scale as well as a sense of identification.