It's 277 miles long, it's up to 18 miles wide, it's 6 million years old & at a given time temperatures within it can vary by 25 degrees
Since that time, the Colorado River has driven the down-cutting of the
... [DOC] [TLE] Frequently Asked Questions - Grand Canyon National Park (U.S. ... [PAR] At the South Rim, near Grand Canyon Village, it's a vertical mile (about 5,000 ... 
16 km (rim to rim), though in places it is as much as 18 miles / 29 km wide.