U.S. Bicycle Route 23 (USBR 23) is a north-south United States Bicycle Route that travels through Middle Tennessee and the Pennyroyal Plateau of region of Kentucky in the United States.
The Tennessee segment was designated on October 17, 2013 as the first national bicycle route in the state. The Kentucky segment was designated May 2019.
Kentucky
The route in Kentucky covers . Within Kentucky the route is named the Cave Country Bike Tour. The northernmost portion of the route runs along the eastern portion of the TransAmerica Trail's Mammoth Cave Loop route.
Tennessee
In Tennessee the route covers .
Spurs
Spur to Natchez Trace is a connector to the Natchez Trace Parkway. Spur to Henry Horton State Park is alternative route to Henry Horton State Park.