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| Cosmeston Lake | |
|---|---|
 from the East | |
  Cosmeston Lake | |
| Location | Penarth, Vale of Glamorgan, Wales |
| Coordinates | 51°25′N 3°11′W / 51.417°N 3.183°W |
| Type | artificial, flooded quarry |
| Basin countries | Wales |
| Surface area | 15 ha (37 acres) |
| Max. depth | 9 m (30 ft) |
| Islands | one |
| Settlements | Cosmeston Medieval Village |
Cosmeston Lakes Country Park is a public country park in Wales, owned and managed by Vale of Glamorgan Council. It is situated between Penarth and Sully, Vale of Glamorgan, 7.3 miles (11.7 kilometres) from Cardiff. On 1 May 2013 the country park was designated a Local Nature Reserve. Parts are Sites of Special Scientific Interest. The park, visitor centre, and cafe are open all year round.