The River Tanat and its dendritic tributaries
dominate this narrow valley landscape running east to west in north
Crown copyright: RCAHMW
Ref number: HLW (P/C) 1
OS map: Landranger 125
Unitary authority: Powys (Denbighshire)
The Tanat separates the Berwyn Mountains, to the north, from the
rolling Mongomery Hills, to the south.
The influence of man in this area has been present from
prehistoric times and has not been confined to the valley floor.
Consequently, the area presents a landscape of great historic
diversity with evidence of land use and settlement patterns from
several periods and of varied nature.
The earliest evidence for occupation in the valley consists of a
series of Bronze Age monuments now only visible from the air as
crop-marks. The individual sites are often small and discrete, but
together they comprise one of the best surviving groups of this
type of archaeological evidence in Wales.
A full published description for this landscape area is
available as a pdf download within the Related Articles section
Principal area designations:
The north western side includes part of the Berwyn National
Nature Reserve. The area includes: Craig Rhiwarth hillfort
Scheduled Ancient Monument; Llangynog, Llanrhaeadr-y-Mochnant and
Penybontfawr Conservation Areas.
Criteria: 3, 4
Contents and significance:
A narrow lowland river valley situated between the Berwyn
Mountains and the Montgomery Hills, containing diverse evidence of
land use from prehistoric to recent times.
The area includes:
significant crop-marks of hidden prehistoric ritual and funerary
sites; large, well-preserved Iron Age hillforts; prehistoric to
recent mining remains; medieval mottes, settlements and Pennant