Eryri has some of the finest wild swimming in Britain. The mountain lakes — cold, clear, surrounded by rock and sky — offer a swimming experience that outdoor pools and lidos simply cannot replicate. From the relatively accessible Llyn Padarn below Llanberis to the remote Glaslyn beneath Snowdon's summit, from the long dark waters of Llyn Cowlyd in the Carneddau to the famous pool beneath the Devil's Kitchen in Cwm Idwal, the national park is filled with extraordinary places to swim.
The Best Locations
Llyn Padarn, Llanberis
The most accessible wild swim in Eryri. The lake lies at the foot of Llanberis, alongside the A4086, and has an established entry point near Padarn Country Park. Water quality is generally good and the lake is popular with paddleboarders, kayakers and swimmers. The views across the water to the Dinorwig slate quarries and Elidir Fawr are dramatic. Llyn Padarn is also home to the char — a rare Ice Age fish — and the Llanberis Lake Railway runs along its southern shore.
Llyn Gwynant, Nant Gwynant
One of the most beautiful swimming locations in Wales. The lake occupies a broad glacial basin in the Nant Gwynant valley with Yr Wyddfa rising steeply behind it. Entry is straightforward from the campsite shore and the water is clear. The setting — reflected mountains, ancient woodland, the sound of the river — is exceptional. Popular on summer weekends; visit midweek or in early morning for a quieter experience.
Glaslyn, Snowdon
The copper-green lake beneath Snowdon's summit, at 600m, is one of the highest swimming locations in Wales. The colour — caused by copper ore in the surrounding rock — is extraordinary. The approach is via the Miners' Track (approximately 5km, 450m ascent). Water temperature is reliably cold even in summer. The combination of colour, altitude and mountain surroundings makes this a memorable swim for those prepared for the walk in.
Safety
Mountain lakes are cold throughout the year — water temperatures even in August rarely exceed 15°C and may be significantly lower in the higher lakes. Cold water shock is a serious risk for unacclimatised swimmers: enter gradually, never dive or jump into cold water for the first time, and swim with a companion whenever possible. Tow floats improve visibility and provide something to rest on. Check entry points before committing to a swim — some lake shores are steep or muddy with no obvious exit.
Independently written — Snowdon.com