Rhayader is a market town and community in Powys, Mid Wales. It has a population of 2,075, and is the first town on the banks of the River Wye, 20 miles (32 km) from its source on the Plynlimon range of the Cambrian Mountains. The town is one of the principal centres of population in the predominantly rural historic county of Radnorshire. It is situated roughly midway between North and South Wales on the A470, 13 miles north of Builth Wells and 30 miles east of Aberystwyth on the A44 - two of Wales' most important trunk roads. The B4574 mountain road to Aberystwyth is described by the AA as one of the ten most scenic drives in the world.