Flatside Wilderness 10,105 acres featuring small creeks, clear springs and good views. A 10 1/2-mile section of the Ouachita National Recreation Trail provides easy access through the heart of the wilderness. Details Owner: Flatside Wilderness Trailhead Location: From the junction of Hwys. 9 and 60, go 13.6 miles south on Hwy. 9; then 8.3 miles west on Forest Road 132; then north 3 miles on Forest Road 94 to Flatside Pinnacle.