Best Places to Visit in the USA Excellent doesn't start to do this canyon equity. Estimating roughly 277 stream miles long, up to 18 miles in width and a mile down, this monstrous gap in northern Arizona is really a characteristic miracle. For 6 million years, the Terrific Ravine has extended with the assistance of the powerful Colorado Stream, and for quite a long time, individuals from everywhere the globe have headed out to look out over its red and orange magnificence. Overseen by the Public Park Administration and formally assigned as an UNESCO World Legacy Site, the Great Ravine leaves its roughly 6 million guests each year awestruck.