Mark Twain National Forest is a separate land layer here

Beyond the river corridor and Echo Bluff State Park, parts of Shannon County fall within Mark Twain National Forest, managed by the USDA Forest Service. National forest land has its own rules for dispersed camping, motor-vehicle use, fire, and hunting, and those rules are not the same as the National Park Service rules on the rivers or the state-park rules at Echo Bluff. For someone planning to camp, hunt, or ride in the backcountry, the practical step is to confirm which agency manages the specific tract and follow that agency’s current rules. The Forest Service publishes maps and use rules for the Mark Twain National Forest. Mixing up the land managers is the most common source of confusion in this county.