Buffalo Gap Trail is a 12 mile hiking trail in Medora, North Dakota.
You can access this trail by riding out to the western exit of Medora under I-94 or you can get on it at the Buffalo Gap Campground which is about 6 miles west of Medora and it starts right at the day-use parking lot.
http://www.tripleblaze.com/trail.php?c=3&i=8002