National Parks near River to River Trail, Hardin County, Illinois River to River Trail Main Page HIGH QUALITY TOPO MAP, CLICK HERE More Information about River to River Trail, Hardin County, Illinois Nearest metro area is Harrisburg, Illinois Click here for more outdoors activities near Harrisburg, Illinois General Camping Information List of nearby National Parks: Mammoth Cave National Park, Mammoth Cave - KY, 142.6 miles away Natchez Trace Parkway, Tupelo - MS, 182.8 miles away Ozark National Scenic River, Van Buren - MO, 192.6 miles away Illinois & Michigan Canal National Heritage Corridor, Lockport - IL, 221.1 miles away Russell Cave National Monument, Bridgeport - AL, 226.5 miles away * Distances listed are direct linear distances, actual travel distance may be different. Go to Illinois Outdoors Index