Twentyone Mile Rapids is a stretch of rapids in Coconino County, Arizona, in the Arizona/New Mexico Plateau region. It lies about 24.3 miles southwest of LeChee and roughly 98.5 miles north of Flagstaff as the crow flies.
The Arizona/New Mexico Plateau is a high, semi-arid tableland of grassland, sagebrush and pinyon-juniper woodland cut by canyons. Waterfalls occur along canyon streams and are strongest during snowmelt and summer monsoon.
Coconino County holds 56 recorded rapids, and several are close by. North Canyon Rapids, is under a mile away. Georgie Rapid, is about 2.8 miles away. Twentyfour and One-half Mile Rapids, is about 3.1 miles away.
Twentyone Mile Rapids is located at 36.6216° N, 111.7603° W. The listing is based on the USGS Geographic Names Information System, one of the sources compiled by the U.S. Geological Survey in its inventory of waterfalls and rapids of the conterminous United States. The position was verified on aerial imagery. Details on trails, parking and access have not been documented for this rapid yet.