Canyon

The Grand Canyon of northern Arizona in the United States, with an average depth of 1,600 m (one mile) and a volume of 4.17 trillion cubic metres, is one of the world's largest canyons. It was among the 28 finalists of the New7Wonders of Nature worldwide poll. (Some referred to it as one of the 7 natural wonders of the world.) Copper Canyon in Chihuahua, Mexico is deeper and longer than the Grand Canyon.

Question: is the grand canyon the biggest canyon in the world
Answer: no