What is the name of the canyon in Arizona known for its Navajo ruins?

What is the name of the famous canyon in South Africa, known for its lush vegetation? What is the name of the canyon carved by the Green River in Utah? In which country is the Tiger Leaping Gorge canyon located? In which mountain range is the Colca Canyon located? In which country is the Cotahuasi Canyon located? What is the name of the largest canyon in the world? Which canyon in Arizona, USA is known for its red rock? In which mountain range is the Samaria Gorge, a famous canyon in Greece?