Landscape - Llyn Cefni

The second largest manmade lake on Anglesey, Llyn Cefni is located fairly centrally on the island, roughly one mile to the north of the town of Llangefni.  A dam was built on the Afon (river) Cefni in the 1940’s, creating the reservoir to supply drinking water to the island.  A currently disused railway called Lein Amlwch cuts the lake in two. This railway used to run from Amlwch Port to the village of Gaerwen where it joined the main line.

The Cefni Angling Association, established in 1952, manages the reservoir as a fishery, with part of the north eastern half being managed as a nature reserve. Two main rivers feed into Llyn Cefni, the Afon Frogwy on the west side and the Afon Erddreiniog entering on the north east side.  This river links the lake to the Cors Erddreiniog National Nature Reserve, which is an important fenland area.  The lake is easily accessible using the Lôn Las Cefni cycleway which meanders along the Afon Cefni from the Dingle in Llangefni and splits at the dam where the river now originates.  Alternatively, there are car parks located at the south western and north eastern tips of the lake.

For a list of public toilets on the island, please see Isle of Anglesey County Council - public toilets

A list of the toilets available through the Community Toilet Grant Scheme is also available

Other Things to do

  • Active and Outdoors

    'Active and Outdoors'

    'Making the most of the great outdoors is easy on Anglesey, as the great outdoors is something we have plenty of. '

  • Cycling


    'What better way to experience all the natural beauty that Anglesey has to offer than by bike. '

  • Heritage


    'Pay a visit to Anglesey and you will see that the island is a living history in itself. '

  • Walking


    'Going for a walk on Anglesey is a pleasure in itself.'

Other Attractions

  • Cycle Wales

    'Cycle Wales'

    'Cycle Wales is a company based on Anglesey.'

  • Isle of Anglesey Rural Cycling Network

    'Isle of Anglesey Rural Cycling Network'

    'Maps and descriptions of the cycle routes. '

  • Oriel Ynys Môn

    'Oriel Ynys Môn'

    'Anglesey's art and heritage gallery and museum.'

  • Wildlife Newborough Forest and Warren

    'Wildlife Newborough Forest and Warren'

    'Newborough Forest and Warren forms the southernmost corner of Anglesey, positioned between the Afon Braint and the Afon Cefni with its extensive estuary. '