Its the Assault on Everything

What you need to know about Super Randonnées (ACP website)

The Southern Appalachian SR600 was developed as a part of the ACP’s Super Randonnée 600km permanents.

Elevation Gain: 10,059 meters / 33,002 feet

Distance: 374.9 miles / 602 km

Gravel climbs, eats high atop Little Switzerland, and a pleasant greenway climb to return.