List of lakes in Wales

This is a list of lakes in Wales. Most lakes in Wales start with the word "Llyn", which is Welsh for "Lake".

By area

In terms of surface area, the eight largest lakes in Wales are
*Llyn Trawsfynydd — convert|1180|acre|km2
*Llyn Tegid (Bala Lake) — convert|1123|acre|km2
*Llyn Brenig — convert|920|acre|km2
*Llyn Celyn — convert|815|acre|km2
*Llyn Alaw — convert|762|acre|km2
*Claerwen Reservoir — convert|664|acre|km2
*Llyn Brianne — convert|530|acre|km2
*Caban-coch Reservoir and Garreg-ddu Reservoir — convert|500|acre|km2

By unitary authority

This list of Welsh lakes ordered by unitary authority includes lakes with a surface area of greater than 5 acres (2 hectares), but excludes those lakes and ponds created as part of an active industrial site (i.e, works ponds) 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 case the lake is represented in the list for each appropriate authority. Known occurrences include Llyn Brenig, Pontsticill reservoir, Llwynon reservoir, Cantref Reservoir and Dol y Gaer reservoir. All occurrences are marked with an asterisk (*).

Anglesey

Ceredigion

Flintshire

Monmouthshire

Powys

Vale of Glamorgan

Wrexham