Refine your search

Type of Venue






Or Venue Name


Nature Reserve:Llyn Mawr Nature Reserve

Nature Reserve, free entry

SY17 5NE



Llyn Mawr is one of three lakes within a Site of Special Scientific Interest, high up on the moorland plateau above the Carno Valley. The reserve comprises the 7.7ha (19 acre) lake itself and a narrow margin of surrounding land adding a further 4.4ha (11 acres).

It is an important site for wildlife conservation of aquatic plants and of bird life in both summer and winter. Visits by the public are welcome but please keep to the southern shore and do not attempt to walk right around the lake. The lake is described as mesotrophic - having a moderate amount of nutrient in the water, derived from the surrounding moorland. It therefore has a relatively rich growth of plants and a correspondingly large number of animals.

In the winter the lake is a popular roost with a number of waterfowl. Ducks such as pochard, wigeon, goldeneye, and the fish-eating goosander come here along with whooper swans - migrants coming south to escape the Arctic winter.

There is an extensive network of bridleways that give access over the moorland and rough grazing of Mynydd Cerrigllwydian, one of which passes Llyntarw, another of the trio of Caersws lakes. This is good curlew country as well as offering hunting grounds for birds of prey including buzzard, kestrel and occasionally merlin and hen-harrier.

Access is limited to one small area of the lakeshore. Short area of boardwalk, other ground can be wet, muddy & uneven.

Open all the time


Free entry


SY17 5NE


Plan route to Llyn Mawr Nature Reserve using Google mapsPlan route using Google maps

Map reference: SO 011969  Lat: 52.56173 Long: -3.45916

Turn north off the A470 about 2.5 miles west of Caersws up the lane to Bwlch y Garreg. Follow the lane up - and up, almost as far as it goes. The lake and a bungalow appear on the left. Park on the roadside verge just before the bungalow. There is a stile and notice to an approach track.

Parking: free

Accessible by Public Transport: 4 miles from Caersws station