Updated
Photo: Llyn Cwmorthin, llyn yn y Moelwynion yng Ngwynedd - a lake nr Blaenau Ffestiniog, Gwynedd, Wales 08.jpg via Wikidata Q13129751 License
Llyn Cwmorthin
Lake
Cool today
Editor's Notes
Llyn Cwmorthin fills a hanging valley above Tanygrisiau near Blaenau Ffestiniog, surrounded by the evocative ruins of a vast slate quarrying community — terraced barracks, a roofless chapel and tramway inclines — that earned the lonely cwm the nickname 'the valley of the lost'.
lake in Gwynedd, Wales
Interactive map not available
Weather at Llyn Cwmorthin
H: 63° L: 47°
Sunny
63°
|
Feels like 59°
Precipitation
8%
Humidity
51%
Wind
4 mph
UV Index
2.7
Water Conditions:
🥶Too cold for most swimmers
12 AM
48°
3 AM
47°
6 AM
47°
9 AM
52°
12 PM
59°
3 PM
63°
6 PM
61°
9 PM
51°
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Compare on Amazon →Frequently asked questions
- Where is Llyn Cwmorthin?
- Llyn Cwmorthin is a lake in Wales.
- Can you swim at Llyn Cwmorthin?
- There is no fixed answer for Llyn Cwmorthin: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Llyn Cwmorthin in Wales. Check current water conditions before you go, and follow posted signs and local guidance.
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Water temperatureCrowds & parkingBest time to goSafety & access
Best Times to Visit
🧥
Right Now
Cool weather - dress warmly
🏞️ Lakes Tips:
- ›Check for boat launch facilities and fees
- ›Obtain required fishing licenses before arrival
- ›Be aware of lake-specific regulations and restrictions
- ›Monitor water quality reports before swimming
Best Seasons:
☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)
Location & Contact
Wales
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