The B4518 road is a road in Powys

Powys

Powys is a local-government county and preserved county in Wales.-Geography:Powys covers the historic counties of Montgomeryshire and Radnorshire, most of Brecknockshire , and a small part of Denbighshire — an area of 5,179 km², making it the largest county in Wales by land area.It is...

, central Wales, with a total length of 30.5 miles (49.1 km). It begins at 52°18′5"N 3°30′41"W in Rhayader

Rhayader

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, from its source on the Plynlimon range of the Cambrian Mountains....

 near the junction of the A470 road

A470 road

The A470 is a major long-distance connective spine road in Wales, running from Cardiff on the south coast to Llandudno on the north coast. It covers approximately 186 miles , over a zig-zagging route through the entirety of the country's mountainous central region, including the Brecon Beacons and...

 and the A44 road

A44 road

The A44 is a major road in the United Kingdom that runs from Oxford in southern England to Aberystwyth in west Wales.-History:The original route of the A44 was Chipping Norton to Aberystwyth. No changes were made to the route of the A44 in the early years...

 and leads eventually to the A470 again at Llanbrynmair

Llanbrynmair

Llanbrynmair is a village and community in Powys, Mid Wales on the A470 road between Caersws and Machynlleth. Llanbrynmair, in area, is the second largest in Powys. In 2005, it had a population of 958.-Description:...

 at
52°36′42"N 3°37′38"W. Enroute going north from Rhayader it passes through the following settlements: St Harmon

St Harmon

St Harmon is a village in Powys, Wales. It is located on the River Marteg on the B4518 road running between Llanidloes and Rhayader.St Harmon FC is the village football team.- External links :*...

, Pant-y-Dwr, Tylwch, Llanidloes

Llanidloes

Llanidloes is a town along the A470 road and B4518 road in Powys, within the historic county boundaries of Montgomeryshire , Mid Wales.It is the first town on the River Severn...

 (where it crosses the A470 again), Staylittle

Staylittle

Staylittle , sometimes referred to colloquially as Y Stay or Y Stae, is a small village set in the shallow upland basin of the River Clywedog on the B4518 road, equidistant from Llanidloes and Llanbrynmair in the county of Powys, Wales.- History :...

, Pont Crugnant, Pennant

Pennant, Powys

Pennant is a small village in Powys, Mid Wales located on the B4518 road between Llanbrynmair and Llanidloes....

, Bont Dolgadfan

Bont Dolgadfan

Bont Dolgadfan is a small village off the B4518 road in Powys, Wales.There are two major estates in Bont Dolgadfan, Dolgadfan itself and Plas Llywn Owen. The area has in the past been used for hunting game....

, Llan

Llan

Llan is a village in Powys, Mid Wales, located on the B4518 road to Llanidloes, from Llanbrynmair.The parish church of St Mary is located here. This area was the original centre of Llanbrynmair up to the early to mid 19th century...

 and Plas Esgair. It passes through the Clywedog Valley and Clywedog Reservoir

Clywedog reservoir

The Clywedog reservoir is a reservoir in the Welsh county of Powys, located off the B4518 road near the town of Llanidloes.The reservoir was formed by damming the Afon Clywedog, a tributary of the River Severn. Its concrete buttress dam is the tallest concrete dam in the United Kingdom, with a...

, built in 1964.