The Ciro Trail runs between Mostar (in Bosnia & Herzogovina) and Trebinje, near Dubrovnik (on the Croatian coast). With around 150km (90 miles) of mostly traffic-free trails using quiet roads and gravel tracks, which can be quite rough at times. The trail is largely flat though as it follows an old Austro-Hungarian railway narrow-gauge railway, which was built in 1903, discontinued in 1976, and made into a cycle path in 2017.
There are a some options to where to start, detour to along the way, such as at Hutovo Nature park (a 13-mile gravel path over viaducts and through old railway tunnels), so be sure to check out the website and plan your own journey.
Website: Ciro Trail
Ride review by Roling Existance
Route type: Long Distance Point 2 Point