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Llanbwchllyn Lake

A fine example of an uncommon mesotrophic lake

The marginal vegetation includes stands of White and yellow water-lilies, amphibious bistort and shoreweed. There are large stands dominated by common reed, with reedmace, bogbean, lesser pond-sedge, bottle sedge and greater spearwort (one of only two known sites in Radnorshire). There is well developed alder and willow carr (wet woodland) around the edge. In the wetter fen areas are meadowsweet, marsh cinquefoil, lesser skullcap, gypsywort, and water horsetail. Drier areas have royal fern, sneezewort and devil's-bit scabious.


Birds include reed warbler and great-crested grebe, both of which breed. In winter the reserve is important for wintering ducks. Mallard, teal, tufted duck, pochard are commonly seen. Goldeneye is now a rare winter visitor. Mute swans are often found, as are cormorants. kingfisher and common sandpiper visit regularly. The lake contains several species of fish, including perch, pike, roach and rudd. Invertebrates are well represented, with plentiful dragonflies and damselflies and the cardinal beetle Pyrochroa serraticornis and uncommon oil beetle Meloe proscarabaeus have been recorded.

Nearby nature reserves

5 miles - Radnorshire Wildlife Trust
6 miles - Radnorshire Wildlife Trust
Glasbury Cutting
6 miles - The Wildlife Trust for South and West Wales

Nature reserve map

Reserve information

North of the B4594 Erwood to Painscastle road
Builth Wells
Map reference
SO 118 464
Great for...
Best time to visit
Jun - Jul
Nov - Mar
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Opening Times
Open at all times
26.70 hectares
Members with Permit

RWT members only as far as the path along the south of the lake (carry your membership card) and access to north and east side of lake. A 200 metre path leads from the entrance to the viewing hide. Beyond here, the path is rough and uneven. Contact RWT for disabled access information.
Walking information
A 200 metre path leads from the entrance to the viewing hide. Beyond here, the path is rough and uneven.
Park in the layby near the entrance gate
No dogs allowed
Grazing animals
Reserve manager
Radnorshire Wildlife Trust
Tel: 01597 823298


Factsheets and guides for your visit