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Ynys Llanddwyn facts for kids

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Ynys Llanddwyn
Ynys Llanddwyn old
Tŵr Bach lighthouse with Snowdonia in background
Area 0.3 km2 (0.12 sq mi)
• Density 0/km2 (0/sq mi)
OS grid reference SH 3884 6288
  • Rhosyr
Principal area
Ceremonial county
Country Wales
Sovereign state United Kingdom
Post town Llangefni
Postcode district LL61
Dialling code 01248
Ambulance Welsh
EU Parliament Wales
UK Parliament
  • Ynys Môn
Welsh Assembly
  • Ynys Môn
List of places
Coordinates: 53°08′15″N 04°24′45″W / 53.13750°N 4.41250°W / 53.13750; -4.41250

Ynys Llanddwyn is a small tidal island off the west coast of Anglesey (Welsh: Ynys Môn), northwest Wales. The nearest town is Newborough.

Geology and geography

The island is of geological interest with pillow lava, jasper formations and aeolian sand deposits.

The island forms part of the National Nature Reserve of Newborough Warren which includes the extensive and floristically rich sand dune system.

Ynys Llanddwyn is a tidal island; it remains attached to the mainland except at high tide. It provides views of Snowdonia and the Llŷn Peninsula.

Saint Dwynwen

The island is rich in legends, in particular in its association with Dwynwen. The name Llanddwyn means "The church of St. Dwynwen". Dwynwen is the Welsh patron saint of lovers, making her the Welsh equivalent of St. Valentine. Her Saint's day is 25 January and is often celebrated by the Welsh with cards and flowers. The island bears the ruined remains of St Dwynwen's Church.


Newborough National Nature Reserve & Forest, of which Ynys Llanddwyn is part, received 478,204 visitors in 2018.


There are more than 10 miles (16 km) of footpaths crossing Ynys Llanddwyn and Newborough Warren, including the Anglesey Coastal Path, and it is a very popular place to visit. The island provides a worth-while goal after the mile-long walk along the beach from the nearest car park. Ynys Llanddwyn, with the neighbouring beach, has been awarded Blue Flag beach status in recognition of the cleanliness of the sea and the beaches.


Tŵr Mawr lighthouse marks the western entrance to the Menai Strait.

Time line

  • 1873 Construction of lighthouse on Ynys Llanddwyn.
  • 1903 Closure of the lifeboat station on Ynys Llanddwyn.
  • 1911 RSPB establishes its first reserve in Wales at Ynys Llanddwyn
  • 3 December 1920 - Five crew members from the Rhoscolyn lifeboat are lost off Llanddwyn, Anglesey.

Ynys Llanddwyn in film

  • In 2004, Ynys Llanddwyn was used as a filming location in Demi Moore's romantic thriller Half Light. Tŵr Mawr was used as a lighthouse which plays a key role in the film. CGI was used to create the effect of a real light on top of the lighthouse.
  • Bryn Terfel filmed his video for Cavatina (arranged by Chris Hazell) on Ynys Llanddwyn "a very beautiful romantic place" (Bryn on BBC Breakfast)
  • In 2009, a scene for the Hollywood blockbuster Clash of the Titans was filmed at Llanddwyn.
  • BBC Wales show ‘’The 1900 Island’’ was filmed on the island the show was broadcast nationally in 2019.

Photos of Llanddwyn

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