Pant y Llyn

Useful Information

Location: Builth Wells, LD2 3RJ.
South of Builth Wells, between A470 and B4520 'Eppynt' to Brecon. From Builth Wells south on B4520 4.5 km. turn left on single lane paved road through Pen-y-garreg. After 1.36 km unsigned trail on grass to the left. Follow trail north 700 m.
(52.10931638969019, -3.405185862475906)
Open: No restrictions.
Fee: free.
Classification: KarstKarst Lake
Light: n/a
Dimension: L=283 m, W=196 m, VR=3 m.
Guided tours: self guided
Photography: allowed
Accessibility: no
Bibliography: Gareth Farr, Tristan Hatton-Ellis, David Jones, Caleb Lambourne, Jamie Bevan, Owen Naughton (2012): Hydrology, Water Quality and Condition of Pant-y-Llyn, Wales' only Turlough, CCW Staff Science Report No 12/8/1, 64pp, CCW, Bangor. researchgate
As far as we know this information was accurate when it was published (see years in brackets), but may have changed since then.
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Pant-y Llyn is Wales and Britain's only recorded turlough. It has an estavelle which fills the lake with karst water at times of high water level, and swallows the lake again at times of low water level. So the depth and existence of the lake depends on the rainfall, but with a delay. The water level peaks lag behind heavy rainfall events by between 1 and 8 days. Recharge is more rapid during wetter months when the water table is higher.