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Llyn Cwmorthin

Wild Swimming Spot

Terrain:

Activities

Best Time To Visit

Lakeside, Mountain, Valley

Swimming

Spring to Autumn

Photo: Bill Harrison via Geograph.org.uk

Stepping onto the muddy track leading up from Tanygrisiau forces an immediate encounter with a stark industrial wilderness that shatters all typical expectations of a country walk. This vast, deep sheet of mountain water occupies a high basin carved out by generations of Victorian quarrymen who hol...

10

Parking nearby

1

Food Spots nearby

3

Staycations nearby

Parking:

Food:

Staycations:

3 day, 7 overnight

Caffi Gwynant​

Slate Mountain Cottage, Tanygrisiau Home, Tanygrisiau House

FAQ's/Things to Know

Where is Llyn Cwmorthin?
North Wales contains this mountain lake, situated high above the village of Tanygrisiau. Hikers find it surrounded by old slate quarries after walking up a rough, muddy track.

What type of place is Llyn Cwmorthin?
Llyn Cwmorthin is a wild swimming spot in the mountains of North Wales 813\.

When is the best time to visit Llyn Cwmorthin?
Spring through to autumn offers the best window for a dip when weather conditions remain manageable 813\. Sunny afternoons during these months help counteract the naturally chilly water temperatures.

What can you do at Llyn Cwmorthin?
Swimming across the deep, dark mountain waters provides an incredible rush for anyone brave enough to jump in 813\. People also spend hours exploring the abandoned stone cabins and mining ruins lining the water.

How long should I spend at Llyn Cwmorthin?
Allowing roughly half a day ensures enough time for the steep uphill walk and a good swim. Shorter visits might cut your exploration of the historic valley a bit too brief.

Where do I park at Llyn Cwmorthin?
Spaces for ten vehicles exist close by, divided into three day and seven overnight allocations 813\. Full details are available on the UK Hidden Gems app.

Where can I eat near Llyn Cwmorthin?
Caffi Gwynant provides the single dining choice recorded in the area 813\. Full details are available on the UK Hidden Gems app.

Where can I stay near Llyn Cwmorthin?
Slate Mountain Cottage, Tanygrisiau Home, and Tanygrisiau House offer three choices for accommodation in the vicinity 813\. Full details are available on the UK Hidden Gems app.

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Last Updated:

02 July 2026

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