Here's what GORP says about the 76-mile long Foothills Trail:

The Massanutten Mountain Trail is a National Recreation Trail. It is a 71-mile loop in the George Washington National Forest, on the ridgelines of the eastern and western ranges of the Massanutten Mountain. According to the Virginia Happy Trails Running Club (VHTRC): "The 'trail' is hard, rocky, and slow.

The Ozark Highlands Trail stretches 200+ miles through northwest Arkansas. It was built, and is maintained, by the Ozark Highlands Trail Association.

The Ouachita National Recreation Trail stretches 223 miles through the Ouachita Mountains, from Talimena State Park in Oklahoma to Pinnacle Mountain State Park in Arkansas. More information and maps are available from the U.S. Forest Service https://www.fs.usda.gov/ouachita site.