The third, and least frequented route is the 16-kilometre 6-hour Aghavannagh Route, which starts at the Aghavannagh Bridge () and walks the long forest tracks along the River Ow to the dramatic South Prison of Lugnaquilla, which is exited via the grassy-ramp of Green Street; return via same route. The 12-kilometres of forest trails (getting to the south prison, and then on the return to the bridge) can be cycled instead.