Llanbwchllyn Lake

Llanbwchllyn Lake Nature Reserve

Emma Morgan

Llanbwchllyn Lake Nature Reserve

Emma Morgan

Llanbwchllyn Lake

A fine example of an uncommon mesotrophic lake.


Off B4594 Erwood to Painscastle road
Llandeilo Graban
Builth Wells

OS Map Reference

SO 116 466
A static map of Llanbwchllyn Lake

Know before you go

27 hectares

Parking information

Limited - please park on the roadside verge taking care not to obstruct the highway.

Grazing animals


Walking trails

A 200m path leads you through the wooded entrance to the bird hide.  Beyond here, the path is rough and uneven, so please take special care.


This nature reserve is managed by Radnorshire Wildlife Trust (RWT) on a lease from Dŵr Cymru Welsh Water and as such there is limited access to the reserve.

The hide is not open as a very large ash is in the advanced stage of dieback and poses a risk to visitors.

Find out more about Ash Dieback at RWT Reserves

Members of RWT may venture further but should carry their membership card.  Anglers have rights to use the lake, therefore please be respectful of one another.


No dogs permitted


Bird hides

When to visit

Opening times

All year round.

Best time to visit

November to July

About the reserve

This large natural lake is edged with reed bed lush fen vegetation that gives cover to breeding reed warbler and great crested grebe.  It welcomes overwintering wildfowl including goosander, teal, tufted duck, pochard and goldeneye.  Coot and water rail use the reeds as refuge throughout the year.

The rich marginal vegetation includes stands of white and yellow water lilies, greater spearwort and bogbean.  Dragonflies and damselflies are abundant in the summer months.

There is well developed wet woodland with alder and willow carr around the edge of the lake.  In the wet grassland and fen meadow, marsh orchids flower in June with devil's-bit scabious and lesser skullcap out later in the summer.

The lake is not to be entered under any circumstance.

Contact us

Radnorshire Wildlife Trust
Contact number: 01597 823298
Contact email: info@rwtwales.org

Environmental designation

Ancient Woodland
Site of Special Scientific Interest (SSSI)