List of lakes of Wales


This is a list of lakes in Wales, including those created as reservoirs. The names of most lakes in Wales start with the word "Llyn", which is Welsh for "lake". All lakes listed here are named on the relevant Ordnance Survey map at 1:25000 scale

By area

In terms of surface area, the ten largest lakes in Wales are
All of the above, with the exception of Llyn Tegid, are reservoirs held back by dams. Llyn Tegid was the largest natural lake in Wales though its level is now artificially controlled. The largest natural lake in South Wales is Llangors Lake or Llyn Syfaddan, which is also the second largest natural lake.

By unitary authority

This list of Welsh lakes ordered by unitary authority includes lakes with a surface area of greater than, but excludes those lakes and ponds created as part of an active industrial site and also excludes service reservoirs used to store drinking water as part of the water supply system. Grid references identify the approximate centre of the lake or the dam in the case of artificial reservoirs. For some lakes the unitary authority boundary passes through a lake; in these cases the lake is represented in the list for each appropriate authority. Known occurrences include Llyn Brenig, Pontsticill Reservoir, Llwyn-on Reservoir, Cantref Reservoir and Dol-y-gaer Reservoir. All occurrences are marked with an asterisk.

Anglesey

Blaenau Gwent

Bridgend

Caerphilly

Cardiff

Carmarthenshire

Ceredigion

Conwy

Denbighshire

Flintshire

Gwynedd

Merthyr Tydfil

Monmouthshire

Neath Port Talbot

Pembrokeshire

Powys

Note: Caban Coch and Garreg-ddu reservoirs are separately named but form one contiguous area of water at normal levels. The area quoted is for the two combined.

Rhondda Cynon Taf

Swansea

Torfaen

Vale of Glamorgan

Wrexham

Lakes by national park

Lakes and reservoirs within each of Wales' three national parks.

Brecon Beacons

Pembrokeshire Coast

Snowdonia

Former lakes