The Berthin Brook is a minor right bank tributary of the
River Usk
The River Usk (; ) 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 flows north int ...
in
Monmouthshire
Monmouthshire ( ; ) is a Principal areas of Wales, county in the South East Wales, south east of Wales. It borders Powys to the north; the English counties of Herefordshire and Gloucestershire to the north and east; the Severn Estuary to the s ...
, in south
Wales
Wales ( ) is a Countries of the United Kingdom, country that is part of the United Kingdom. It is bordered by the Irish Sea to the north and west, England to the England–Wales border, east, the Bristol Channel to the south, and the Celtic ...
. Flowing north from
New Inn
New Inn () is a village and community directly south east of Pontypool, within the County Borough of Torfaen in Wales, within the historic boundaries of Monmouthshire. It had a population of 5,986 at the 2011 Census.
Location
The village is bo ...
initially, it turns east at
Little Mill to flow along a former
glacial meltwater channel past the former
Royal Ordnance Factory site (now BAE Systems) at
Glascoed 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