Lakes and Swim Spots in Wales

The northern half of Wales has numerous lakes and other places suitable for swimming. Generally, swimming is allowed in most natural lakes, but not in reservoirs. Lakes can be cold and very deep - especially if high up in the mountains, so take care when swimming. Welsh lakes can be classed as either oligotrophic or mesotrophic. Oligotrophic lakes are low in nutrients, and therefore have little or no algal growth. This makes entry easier as the bottom isn't slippery. Such lakes are usually found high in the mountains. Mesotrophic lakes are found lower in the valleys, and often have considerable algae growth on the bottom, as well as various water-weeds. Remember: lakes are not swimming pools and are often very deep. You may swim into water weeds, or if the lake has wooded sides, there may be tree branches in the water. Always swim within your ability and don't get tempted to swim across a lake unless you're a competant swimmer.

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Llyn Cwmorthin
Llyn Cwmorthin
A good lake for swimming, near Blaenau Ffestiniog.
Llyn Cwm corsiog
Llyn Cwm Corsiog & Lyn Clogwyn brith
Two former reservoirs, high up in the mountains above Blaenau Ffestiniog
Llyn Llydaw
Llyn Llydaw
A good lake for swimming, part-way up Snowdon.
Glaslyn (Snowdon)
Glaslyn (Snowdon)
A deep corrie lake on the path up Snowdon. Cryystal clear water
Moel Siabod Quarry Lake
Moel Siabod Quarry Lake
A deep quarry lake on Moel Siabod
Llyn y Foel
Llyn y Foel
A shallow lake part-way up Moel Siabod.
Llyn Llagi
Llyn Llagi
A circular moorland lake.
Llynau Mymbyr
Llynau Mymbyr
A good lake for swimming and watersports - just west of Capel Curig.
Llyn Gwynant
Llyn Gwynant
A large lake good for swimming, easily accessed from the A498.
Llyn Dinas
Llyn Dinas
A good lake for swimming, easy access from the A498.
Bala Lake
Bala Lake
Wales' largest lake - 4 miles long and ½ mile wide. Good beach area and facilities. Bala town within walking distance.
Tal-y-Llyn
Tal-y-Llyn
A long, but shallow lake beneath Cadair Idris. Parking available in laybys.
Llyn Cau
Llyn Cau
A very deep, circular lake at about 1500 feet up Cadair Idris.
Llyn-y-Gadair
Llyn-y-Gadair
An oligotrophic lake high up on the Foxes' path up Cadair Idris
Llyn Cwm Bychan
Llyn Cwm Bychan
A scenic lake about 5 miles from Llanbedr. Good base for walking.
Llyn Gafr
Llyn Gafr
A small lake on the Foxes' path up Cadair Idris.
Llyn Idwal
Llyn Idwal
A popular lake for swimming, just over ½ mile from the A470.
Llyn Bochlwyd
Llyn Bochlwyd
At a height of 1820 feet, this lake is alongside the path up Glyder Fach.
Glaslyn
Glaslyn
A circular oligotrophic lake, in the mountains above Machynlleth.
Fairbourne Blue Lake
Fairbourne Blue Lake
An abandoned quarry lake, very popular for swimming. Entrance is via a short tunnel.
Pont Llanelltyd
Pont Llanelltyd
A popular swim spot, just off the A496 near Dolgellau. A good place to stop for a break on a hot day.
Teifi Pools
Teifi Pools
Six small lakes - three of which are used as reservoirs - about 20 miles east of Aberystwyth