Hemmed-In Hollow Trail winds through Buffalo National River's stunning landscapes in AR. At 6.4 miles with 1200 feet of gain, this hard trail draws hikers seeking Arkansas's natural beauty. Trail details: 6.4 miles, 1200ft elevation, Hard. Type: Out-and-Back. Surface: Rocky. Duration: 4 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Local wildlife includes deer, black bears, peregrine falcons. Arkansas's rich biodiversity rewards patient observers on the trail. Prime seasons: Year-round; tallest waterfall between Rockies and Appalachians. Pack ample water, snacks, and a rain layer — Arkansas weather can be unpredictable, especially in the Ozarks and Ouachitas. Help protect Arkansas's wild places: stay on trail, pack out all waste, and yield to other users on the path.