Sarn Helen refers to several stretches of Roman road in Wales. The 160 mi (260 km) route, which follows a meandering course through central Wales, connects Aberconwy in the north with Carmarthen in the west. Despite its length, academic debate continues as to the precise course of the Roman road. Many sections are now used by the modern road network while other parts are still traceable. However there are sizeable stretches that have been lost and are unidentifiable.