Lost Valley Trail winds through Buffalo National River's stunning landscapes in AR. At 2.2 miles with 300 feet of gain, this easy trail draws hikers seeking Arkansas's natural beauty. Trail details: 2.2 miles, 300ft elevation, Easy. Type: Out-and-Back. Surface: Rocky. Duration: 1.5 hours. Fee: Free. Dogs: Yes, on leash. Permit: No. Local wildlife includes deer, salamanders, cave swallows. Arkansas's rich biodiversity rewards patient observers on the trail. Prime seasons: Year-round; Eden Falls cave at the end. 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.