This site comprises an extensive area of
semi‑natural woodland situated in a steep‑sided valley. A variety
of wet and dry woodland types are present, and together they
support a rich assemblage of higher and lower plants. The field
layer is extremely rich and supports species such as wood anemone,
lady‑fern, false brome, bluebell, yellow archangel, yellow
pimpernel, dog's mercury, harts‑tongue, lesser celandine and wood
Managing this site
The site is owned and managed by the Brecknock Wildlife Trust,
the National Trust and various private owners. The special features
of this SSSI and CCW’s views about site management have been
summarised in a Site Management Statement, addressed to the owners
and managers of the land. The statement can be found in the
resource section below.
Access is restricted to a number of footpaths crossing the site.
For detailed maps and information regarding access visit our access
map via the resource section below.
Part of this site is included in the River Usk/Afon Wysg Special
Area of Conservation. Coed is ‘woodland, trees’ (coed); nant is
‘valley, stream’. The final element is difficult. RJ Thomas in
Enwau Afonydd a Nentydd Cymru (pp.209-10), suggested ma- ‘place’
and a personal name Hesgyn, or hesgen ‘sedge’or hesgyn, hesgin