List of lakes in Wales

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This is a list of lakes in Wales.

Contents

[edit] By area

In terms of surface area, the eight largest lakes in Wales are

[edit] 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 (*).

[edit] Anglesey

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Alaw River Alaw SH375853 762 Water supply to north Anglesey
Llyn Bodgylched No main catchment SH585770
Llyn Cefni Afon Cefni SH443771 167 Water supply to central Anglesey
Llyn Coron No main catchment SH380700 69
Llyn Dinam No main catchment SH312778 24
Llyn y Gors No main catchment SH575748 Amenity (fishing)
Llyn Gwaith-glo No main catchment SH450713
Llyn Llygeirian No main catchment SH347898
Llyn Llywenan No main catchment SH347815
Llyn Llwydiarth Afon Braint SH549786
Llyn Maelog No main catchment SH325730 59
Llyn Pen y Parc No main catchment SH585751 Water supply (disused)
Llyn Penrhyn No main catchment SH313770 55 RSPB bird reserve
Llyn Rhosddu No main catchment SH425648
Llyn Traffwll No main catchment SH325770 91
Llyn Treflesg No main catchment SH307770 RSPB bird reserve

[edit] Cardiff

Lake name Catchment Grid ref. Area (acres) Status/Use
Cardiff Bay Barrage River Taff ST190726 Amenity
Llanishen Reservoir River Rhymney ST185815 Water supply to Cardiff
Lisvane Reservoir River Rhymney ST189822 Water Supply to Cardiff
Roath lake River Rhymney ST184795 Recreation and amenity

[edit] Carmarthenshire

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Brianne River Tywi SN790485 530 Regulation reservoir
Upper and Cwm Lliedi Reservoirs SH000000 ex water supply
Llyn y Fan Fach River Tywi SN803219
Usk Reservoir River Usk SN832288 Water supply

[edit] Ceredigion

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Berwyn River Teifi SN743569 40 Natural lake
Llyn Craigpistyll River Rheidol SN722858 Natural lake
Dinas Reservoir River Rheidol SH000000 Hydrolecticity
Llyn Du River Severn SN800698 Natural lake
Llyn Egnant River Teifi SN792674 Water supply
Falcondale Lake River Teifi SN563491 Amenity
Llyn Frongoch River Ystwyth SN721752 Lead mining ?/ Natural
Llyn Fyrddon Fach River Severn SN796701 Natural lake
Llyn Fyrddon Fawr River Severn SN800708 Natural lake
Llyn Glandwgan River Ystwyth SN707752 Natural lake
Glanmerin Lake River Dyfi SN755990 Natural lake
Llyn y Gorlan River Teifi SN786670 Water supply
Llyn Gwngi River Severn SN839729 Natural lake
Llyn Hir River Teifi SN789676 Water supply
Nant y Moch Reservoir River Rheidol SN870636 Hydroelecticity
Llyn Rhosrhydd River Ystwyth SN705759 Natural lake
Llyn Syfydrin River Rheidol SN723848 Natural lake
Llyn Teifi River Teifi SN781675 Water supply

[edit] Conwy

Lake name Catchment Grid ref. Area (acres) Status/Use
Aled Isaf Reservoir River Clwyd SH912594 Water supply
Llyn Aled River Clwyd SH917574 Water supply
Llyn Alwen River Dee SH943538
Llyn Bochlwyd River Ogwen SH654592 10
Llyn Bodgynydd SH760592 14 Industrial supply (disused)
Llyn Brenig River Dee SH973555 920 Flow regulation
Llyn Coedty River Conwy SH754666 Hydroelectricity
Llyn Conwy River Conwy SH780462 Water supply for Llanrwst
Llyn Cowlyd River Conwy SH727624 269 Water supply for Conwy
Llyn Crafnant River Conwy SH749610 52 Water supply for Llanrwst
Dulyn Reservoir River Conwy SH700665 33 Water supply
Llyn Eigiau River Conwy SH720651 120
Llyn Elsi River Conwy SH783552 26
Llyn Geirionydd River Conwy SH763608 45
Llyn Goddionduon River Conwy SH753586 10
Ffynnon Lloer River Ogwen SH662621 6
Ffynnon Llugwy River Conwy SH692627 40
Llynnau Mymbyr River Conwy SH000000 58
Llyn Ogwen River Ogwen SH659604 78
Llyn y Parc River Conwy SH792588 22

[edit] Denbighshire

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Brân SH000000
Llyn Brenig River Dee SH973555 920 Flow regulation
Nant-y-Ffrith Reservoir SH000000
Pendinas Reservoir SH000000

[edit] Flintshire

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Helyg River Clwyd SJ113772 37

[edit] Gwynedd

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn yr Adar River Glaslyn SH655479 10
Llyn Anafon Afon Aber SH698698 13 Water supply
Llyn Arenig Fach SH827417 34 Natural lake
Llyn Arenig Fawr River Dee SH846380 84 water supply for Bala town
Llynnau Barlwyd River Dwyryd SH710484 10 + 5 Industrial water supply
Llyn y Bi River Mawddach SH669264 6
Llyn Bodlyn Afon Ysgethin SH648239 42 Water supply
Llyn Bowydd River Dwyryd SH725467 22 Industrial water supply.
Llyn Caerwych River Dwyryd SH640350 5
Llyn Cau River Dysynni SH714123 33
Llyn Celyn River Dee SH000000 815 River Regulation
Llyn Conglog River Dwyryd SH674473 18
Llyn Conglog Mawr River Dwyryd SH758387 8
Craiglyn Dyfi also written as Creiglyn Dyfi River Dyfi SH867225 15 Natural corrie lake
Llyn Croesor River Glaslyn SH661457 5
Llyn Cwm Corsiog SH663470 7 Industrial water supply (disused)
Llyn Cwellyn Afon Gwyrfai SH559549 215 Water supply
Llyn Cwm Bychan Afon Artro SH640312 25
Llyn Cwm Dulyn River Llyfni SH492495 34 Water supply
Llyn Cwmffynnon River Conwy SH649562 20
Llyn Cwm-mynach River Mawddach SH678237 14
Llyn Cwmorthin River Dwyryd SH677463 22
Llynnau Cwm Silyn River Llyfni SH513508 15 + 15
Llyn Cwm y Foel River Glaslyn SH655468 8
Llyn Cwmystradllyn River Dwyfor SH561444 98 Natural lake
Llyn Cynwch River Mawddach SH737207 26 Amenity
Llyn Dinas River Glaslyn SH616495 60 Natural lake
Llynnau Diwaunedd River Conwy SH682537 19 + 13 Natural lakes
Llyn Dulyn Afon Ysgethin SH661244 5 Natural lake
Llyn Du'r Arddu River Seiont SH600557 5 Natural lake
Llyn Dwythwch River Seiont SH570580 24
Llyn y Dywarchen Afon Gwyrfai SH560534 40
Llyn Edno River Glaslyn SH62497 10
Llyn Eiddew-mawr Afon Artro SH646338 22
Llyn Ffynnon y Gwas Afon Gwyrfai SH591553 10
Llyn y Gadair Afon Gwyrfai SH568521 50
Llyn Gwynant River Glaslyn SH644519 85
Llyn Hesgyn River Dee SH885442 5
Llyn Hywel SH663266 13
Llyn Idwal River Ogwen SH645596 28
Llyn Llagi River Glaslyn SH649482 8
Llyn Llydaw River Glaslyn SH629543 110
Llyn Llywelyn River Glaslyn SH562499 6
Llyn Mair River Dwyryd SH652412 14
Marchlyn Bach reservoir River Seiont SH607625
Marchlyn Mawr River Seiont SH615622 Hydroelectricity
Llyn Mwyngil River Dysynni SH717099
Llyn Nantlle Uchaf Afon Llyfni SH514530 80
Llyn Newydd River Dwyryd SH722471 12
Llyn Peris River Seiont SH591595 95
Llyn Padarn River Seiont SH572613 280 Hydroelectricity
Tanygrisiau reservoir River Dwyryd SH679441 95
Llyn Tecwyn Isaf SH629370 7
Llyn Tecwyn Uchaf River Dwyryd SH640381 31
Llyn Tegid – (Bala Lake) River Dee SH911338 1,123
Llyn Teyrn River Glaslyn SH641547 5
Llyn Trawsfynydd River Dwyryd SH674377 1,180 Nuclear and Hydroelectricity
Llyn Tryweryn River Dee SH788384 20
Llyn Wylfa SH000000 6

[edit] Merthyr Tydfil

Lake name Catchment Grid ref. Area (acres) Status/Use
Cantref Reservoir * River Taff SN996154 Water supply
Dol y Gaer Reservoir * River Taff SO060118 Water supply
Llwynon Reservoir * River Taff SO012113 Water supply
Pontsticill Reservoir * River Taff SO060118 Water supply

[edit] Monmouthshire

Lake name Catchment Grid ref. Area (acres) Status/Use
Llandegfedd reservoir River Usk ST325985 434 Water supply
Wentwood reservoir River Usk ST430929 41 Water supply

[edit] Neath Port Talbot

Lake name Catchment Grid ref. Area (acres) Status/Use
Eglwys Nunydd River Afan SS791855 260 Industrial water supply + fishing
Kenfig Pool River Kenfig SS791855 70 Natural lake

[edit] Pembrokeshire

Lake name Catchment Grid ref. Area (acres) Status/Use
Bosherston ponds Coastal stream SR974946 Natural lakes
Llys-y-Frân Western Cleddau SN036242 212 Water supply
Rosebush Reservoir Western Cleddau SN061291 30 Water supply

[edit] Powys

Lake name Catchment Grid ref. Area (acres) Status/Use
Beacons Reservoir River Taff SN987182 52 Water supply
Caban-coch Reservoir River Severn SN924645 500 (including Garreg-ddu Reservoir) Water supply
Cantref Reservoir * River Taff SN996154 42 Water supply
Claerwen Reservoir River Severn SN869963 664 Water supply
Llyn Clywedog River Severn SN911870 River regulation
Craig-goch Reservoir River Severn SN893686 217 Water supply
Cray reservoir River Usk SN883220 100 Water supply
Dol y gaer Reservoir (Pentwyn) * River Taff SO054144 Water supply
Garreg-ddu Reservoir River Severn SN911639 500 (including Caban-coch Reservoir) Water supply
Llangorse Lake River Usk SO132266 327 Natural lake
Llwynon Reservoir * River Taff SO012113 150 Water supply
Llyn y Fan Fawr River Tawe SN832216
Lower Neuadd Reservoir River Taff SO030180 Water supply
Upper Neaudd Reservoir River Taff SO029188 Water supply
Penygarreg Reservoir River Severn SN911673 124 Water supply
Pontsticill Reservoir * River Taff SO060118 Water supply
Talybont Reservoir River Usk SO104205 Water supply
Lake Vyrnwy (Llyn Efyrnwy) SH000000 Water supply
Ystradfellte Reservoir River Neath SN955175 Water supply

[edit] Rhondda Cynon Taff

Lake name Catchment Grid ref. Area (acres) Status/Use
Llyn Fawr River Taff SN917034 24

[edit] Swansea

Lake name Catchment Grid ref. Area (acres) Status/Use
Tawe Barrage River Tawe SH664926 Amenity

[edit] Vale of Glamorgan

Lake name Catchment Grid ref. Area (acres) Status/Use
Cosmeston Pond River Cadoxton ST176692 Amenity
Hensol Castle Lake River Ely ST045789 Amenity

[edit] Wrexham

Lake name Catchment Grid ref. Area (acres) Status/Use
Cae Llwyd Reservoir SJ270479
Ty Mawr Reservoir SJ276480
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