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Photo: Llyn Celyn dam and tower w.JPG via Wikidata Q3401399 License

Llyn Celyn

Reservoir

Rainy today

Llyn Celyn (Welsh pronunciation: [ɬɨ̞n ˈkɛlɨ̞n]) is a reservoir constructed between 1960 and 1965 including the highly controversial Tryweryn flooding in the valley of the River Tryweryn in Gwynedd, Wales. This included the forcible removal of the Capel Celyn village residents despite protest and opposition of Welsh MPs. With an area of 320 hectares (1.2 sq mi), it measures roughly 2.5 miles (4.0 km) long by 1 mile (1.6 km) wide, and has a maximum depth of 140 ft (43 m).

Interactive map not available

Weather at Llyn Celyn

45°F, Light rain · H 46° / L 38° · 91% chance of rain
H: 46° L: 38°
Light rain
Light rain
45°
|
Feels like 44°
Precipitation
91%
Humidity
99%
Wind
3 mph
UV Index
0
Weather notes:
🌧️Rain expected
12 AM
Overcast
39°
3 AM
Clear
38°
6 AM
Overcast
42°
9 AM
Light rain
43°
12 PM
Light drizzle
45°
3 PM
Light drizzle
46°
6 PM
Light drizzle
45°
9 PM
Mist
44°

Frequently asked questions

Where is Llyn Celyn?
Llyn Celyn is a reservoir in Wales.
Can you swim at Llyn Celyn?
There is no fixed answer for Llyn Celyn: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Llyn Celyn in Wales. Check current water conditions before you go, and follow posted signs and local guidance.

Location & Contact

Wales

🏞️ Best times & visiting 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
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