Buffalo National River Civil War Heritage Trail Ozarks Region Get Directions Tell us why this business is your favorite! Physical Address: 402 North Walnut, Suit 136 Marshall, AR 72601 Phone: 870-741-5443 Website: http://www.nps.gov/buff/ GPS: N35.9068348 W92.6287716 On Lake/River (Buffalo National River) The Buffalo National River is a 95,000-acre national park that preserves unique natural and cultural features of the Arkansas Ozarks. During the Civil War the rugged terrain became a battleground between aggressive independent Confederate units and the Union forces holding northwest Arkansas. Skirmish sites, saltpeter caves and Civil War-era farms are interpreted. Exhibit at the Tyler Bend Visitor Center on US 65 at Silver Hill. Accessible Add to Trip Planner