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This is a list of lakes in Wales. Most lakes in Wales start with the word "Llyn", which is Welsh for "Lake".
Contents
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 5 acres (2.0 ha), 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 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 (*).