It varies from 6.4 - 29 kilometers or about 18 miles from rim to rim.
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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
To estimate how many Mount Everests fit in the Grand Canyon, we can compare their volumes. Mount Everest has a height of about 8,848 meters, while the Grand Canyon is approximately 1,600 meters deep, 446 kilometers long, and up to 29 kilometers wide at its widest point. The volume of the Grand Canyon is roughly 4.17 trillion cubic meters, while the volume of Mount Everest is about 3.7 million cubic meters. This means that approximately 1.13 million Mount Everests could fit in the Grand Canyon, although this is a rough estimate given the differences in shape and dimensions.
11112435 inches wide
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.
100007.54 mi
1234213421km
300m
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.