B4518 road
# B4518 road

The B4518 road is a road in Powys, central Wales, with a total length of 30.5 miles (49.1 km). It begins at 52°18′5″N 3°30′41″W﻿ / ﻿52.30139°N 3.51139°W﻿ / 52.30139; -3.51139 in Rhayader near the junction of the A470 road and the A44 road and leads eventually to the A470 again at Llanbrynmair at 52°36′42″N 3°37′38″W﻿ / ﻿52.61167°N 3.62722°W﻿ / 52.61167; -3.62722. En route going north from Rhayader it passes through the following settlements: St Harmon, Pant-y-Dwr, Tylwch, Llanidloes (where it crosses the A470 again), Staylittle, Pont Crugnant, Pennant, Bont Dolgadfan, Llan and Plas Esgair. It passes through the Clywedog Valley and Clywedog Reservoir, built in 1964.

