Big South Fork National River. Situated in a remote section of the upper Cumberland Mountains, the 17,372-acre Pickett State Park and Forest possess a combination of scenic, botanical and geological wonders found nowhere else in Tennessee.    Of particular interest are the uncommon rock formations, natural bridges, numerous caves and remains of ancient Indian occupation.  Some say Pickett is second only to the Great Smokey Mountains in botanical diversity.  The park is adjacent to the massive Big South Fork National River and Recreation Area, with more than 100,000 acres of prime wilderness country. Rowboats and canoes are available for rent at the park boat dock.   No personally-owned boats or motors are permitted. Pickett Park Highway, Jamestown, TN - (931) 879-5821.