The River Banwy is a river about long in

Powys Powys ( , ) is a Principal areas of Wales, county and Preserved counties of Wales, preserved county in Wales. It borders Gwynedd, Denbighshire, and Wrexham County Borough, Wrexham to the north; the English Ceremonial counties of England, ceremo ...

, Wales. It is a tributary of the

River Vyrnwy The River Vyrnwy (, ) flows through northern Powys, Wales, and Shropshire, England. The name derives from Severn, the river of which it is a tributary. Course The river used to be sourced from the many rivers and streams running off the mount ...

. The Banwy rises in the hills near the pass which takes the

A458 road The A458 is a route on the UK highway network that runs from Mallwyd, near Machynlleth, in Wales, merging with the A456 Hagley Road and the Quinton Expressway on the outskirts of Birmingham, in England. On the way it passes through Welshpool ...

between

Mallwyd Mallwyd () is a small village at the most southern end of Gwynedd, Wales, in the Mawddwy community, in the valley of the River Dyfi. It lies on the A470 approximately halfway between Dolgellau and Machynlleth, and forms the junction of the A ...

and

Welshpool Welshpool ( ) is a market town and Community (Wales), community in Powys, Wales, historically in the Historic counties of Wales, county of Montgomeryshire. The town is from the Wales–England border and low-lying on the River Severn. The c ...

. The river is called Nant Cerrig-y-groes at its source near Moel y Llyn. Then flowing east, it joins a number of lesser streams before reaching Pont Twrch near the village of Y Foel, at its

confluence In geography, a confluence (also ''conflux'') occurs where two or more watercourses join to form a single channel (geography), channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (main ...

with the river Twrch. Two miles further on, it is joined by the river Gam, which flows down from the Nant yr Eira, between Y Foel and Llangadfan. After flowing past the small village of Llanerfyl, the river meanders between hills of moderate altitude to reach a bridge at

Llanfair Caereinion Llanfair Caereinion () is a market town and community in Montgomeryshire, Powys, Wales upon the River Banwy (also known as the River Einion), around 8 miles west of Welshpool. In 2011 the ward had a population of 1,810; the town itself had a p ...

. For the last of its course it turns northwards through a narrow valley. 'Yr Hafesb' is its local name here. It passes

Mathrafal Mathrafal near Welshpool, in Powys, Mid Wales, was the seat of the Kings and Princes of Powys probably from the 9th century until its destruction in 1213 by Prince Llywelyn the Great. Location On the banks of the River Banwy, just above its ...

, the seat and court of the kings of Powys. Its confluence with the Vyrnwy is near Newbridge.

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Banwy Banwy is a community in northwest Montgomeryshire, Powys, Wales, named after the River Banwy and also called ''Banw'' in Welsh. The community with the villages of Llangadfan and Foel, also called Garthbeibio. It is a sparsely populated area cent ...

1Banwy