The Berthin Brook is a minor right bank tributary of the
River Usk
The River Usk (; cy, Afon Wysg) rises on the northern slopes of the Black Mountain (''y Mynydd Du''), Wales, in the westernmost part of the Brecon Beacons National Park. Initially forming the boundary between Carmarthenshire and Powys, it flo ...
in
Monmouthshire, in south
Wales
Wales ( cy, Cymru ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by England to the Wales–England border, east, the Irish Sea to the north and west, the Celtic Sea to the south west and the ...
. Flowing north from
New Inn initially, it turns east at
Little Mill to flow along a former
glacial meltwater channel past the former
Royal Ordnance Factory
Royal Ordnance Factories (ROFs) was the collective name of the UK government's munitions factories during and after the Second World War. Until privatisation, in 1987, they were the responsibility of the Ministry of Supply, and later the Ministr ...
site (now BAE Systems) at
Glascoed
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Glascoed is a village in Monmouthshire, south east Wales. It is east of Pontypool and west of Usk.
Glascoed is mostly associated with the Royal Ordnance Factory nearby at ROF Glascoed. Llandegveth Reservoir
A reservoir (; from French ...
and by Rhadyr to join the major river 1 km north of the town of
Usk. At the height of the
last ice age (the Devensian), the Usk valley glacier reached as far down the Usk valley as Little Mill and sediment-laden meltwater created a valley
sandur over which the post-glacial Berthin Brook now flows.
References
{{DEFAULTSORT:Berthin Brook
Rivers of Monmouthshire