Cwm Cadlan is a mosaic of wet grassland fields
in a small valley to the north west of Merthyr Tydfil. Lime-rich
waters cascade through the reserve and sustain the unique marshy
grassland habitat, as well as the great variety of specialised
plants and animals that live there.
Marshy grassland and wetlands like this are now uncommon features
of the countryside, with many areas having been drained used
instead in agriculture.
The reserve is part of the Cwm Cadlan Site of Special Scientific
Interest (SSSI) & Special Area of Conservation (SAC).
A single path runs across the reserve, the surface of which is a
little rough, with loose stones under the feet.
Although relatively level, there are a few steeper sections of the
run, and the path can also get muddy and slippery with poor
The site is grazed by cattle, and there are several field gates
on the route, as well as a wooden bridge over the stream. Access to
certain areas of the site are restricted because of the sensitive
plant life, but visitors can wander at will in the higher - and
drier - fields to the east.
How to get there
The reserve can be reached from Hirwaun along the minor road
that leaves the A4059 at Penderyn.
Although there are no formal parking facilities, roadside parking
is possible near the main entrance with space for about three
Unfortunately, there is no public transport directly to the
reserve. You can get more information on available services to
Hirwaun by contacting Traveline Cymru on 0871 2002233. or on
There are no toilets on site, with the nearest public toilets
nearby in Hirwaun.
The reserve is managed by CCW.
You can contact the southern region reserves team via the CCW
enquiries help line on 0845 1306229 or by email at
firstname.lastname@example.org. You can also write to us at the address under
‘Contact the team’.