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It is 18 miles.
The merced river gets up to 50 ft wide at its widest point.
The widest point of the tennessee river is near the tributary of the ohio river, reaching 1 1/2 miles wide at its widest point.
About 150 miles at the widest point
The Grand Canyon averages 10 miles in width. Its narrowest point is in Marble Canyon, where it is 600 feet wide. Its maximum width of 18 miles is found at several different points.
11112435 inches wide
300m
1234213421km
100007.54 mi
The Grand Canyon in Arizona has been carved by the Colorado River for millions of years. It is due to its age that its expanse is so wide.
As the Grand Canyon is a natural land feature as opposed to a man made one the dimensions very widely. It appears the widest points average about 29 Kilometers, while the smaller points are along the lines of 16 Kilometers as measured from rim to rim.