Editing County Wicklow (section)

===Hydrology===
[[File:Powerscourt Waterfall, Wicklow - panoramio (3).jpg|thumb|left|[[Powerscourt Waterfall]], the second highest in Ireland]]
Major rivers include the {{convert|132|km|mi|adj=on|sigfig=3}} [[River Liffey]], Ireland's 8th-longest river, which rises near [[Tonduff]] mountain and flows through the centre of [[Dublin|Dublin City]], reaching the Irish Sea at [[Dublin Bay]].<ref name="RvrsStrmsDubReg">{{cite book| title = The Rivers and Streams of the Dublin Region | date = 2018 | isbn = 9780956636386 | pages = 33–35}}</ref> Its biggest tributary by volume, the [[River Dodder]], rises along the northern slope of [[Kippure]] in the far north of the county, while the Kings River joins at Blessington Lakes. Multiple other Liffey tributaries flow within the county.<ref name="RvrsStrmsDubReg"/>

The {{convert|117.5|km|mi|adj=on|sigfig=3}} [[River Slaney]], which starts at Lugnaquilla, flows west and then south before reaching [[St George's Channel]] at [[Wexford]] town.<ref>[http://www.serbd.com/MultiDownloads/Creport/Chapters/Physical%20Description%20Ch3.pdf South Eastern River Basin District Management System. Page 38] {{webarchive|url=https://web.archive.org/web/20160303222354/http://www.serbd.com/MultiDownloads/Creport/Chapters/Physical%20Description%20Ch3.pdf |date=2016-03-03 }}</ref> The [[Avonmore River|Avonmore]] and [[River Avonbeg|Avonbeg]] rivers join to form the [[River Avoca|Avoca River]] at the ''Meeting of the Waters'' in the Vale of Avoca.<ref name=":0">{{cite web|url=http://www.serbd.com/MultiDownloads/Creport/Chapters/Physical%20Description%20Ch3.pdf|title=South Eastern River Basin District Management System Initial Characterisation Report: Physical Description|website=South Eastern River Basin District|archive-url=https://web.archive.org/web/20160303222354/http://www.serbd.com/MultiDownloads/Creport/Chapters/Physical%20Description%20Ch3.pdf|archive-date=2016-03-03|url-status=dead|access-date=2015-03-02}}</ref> The [[River Derreen]] in the south of the county defines a section of the border with Carlow.

[[File:Poulaphouca Reservoir - panoramio.jpg|thumb|The [[Poulaphouca Reservoir]] near [[Blessington]] is Ireland's largest artificial lake]]
Most of the county's lakes (or loughs) are glacially derived [[Ribbon lake|ribbon]] and [[Tarn (lake)|corrie lakes]] found in scenic [[trough valley]]s surrounded by mountains, making them popular with tourists.<ref>{{cite web |url=https://visitwicklow.ie/listing/lough-tay-guinness-lake/ |title=Lough Tay – The Guinness Lake |work=Visit Wicklow |date=25 February 2015 |publisher=visitwicklow.ie |access-date=24 August 2021 |archive-date=24 August 2021 |archive-url=https://web.archive.org/web/20210824025228/https://visitwicklow.ie/listing/lough-tay-guinness-lake/ |url-status=live }}</ref> Notable lakes in the county include [[Glendalough Upper Lake]], [[Lough Tay]] ('The [[Guinness Estate|Guinness]] Lake'), [[Tonelagee#Gallery|Lough Ouler]] ('The Heart-shaped Lake'), Lough Bray, [[Lough Dan]] and Lough Nahanagan.

[[Poulaphouca Reservoir]] is the largest of Wicklow's lakes, covering {{convert|2226|ha|acres|sigfig=3}} in the west of the county.<ref>{{cite web |location=IE |url=https://www.oireachtas.ie/ga/debates/debate/dail/1936-11-04/50/ |title=Liffey Reservoir Bill, 1936—Second Stage |work=Government of Ireland |publisher=oireachtas.ie |access-date=22 August 2021 |archive-date=24 August 2021 |archive-url=https://web.archive.org/web/20210824025233/https://www.oireachtas.ie/ga/debates/debate/dail/1936-11-04/50/ |url-status=live }}</ref> It is the largest artificial lake in Ireland and was created following the damming of the [[River Liffey]] at [[Poulaphouca]] in 1940. The village of Ballinahown was completed submerged by the reservoir and its 70 families were relocated. Ruins of the old village including buildings, fences and farm machinery can be seen during droughts when water levels in the reservoir diminish.<ref>{{cite web |url=https://www.independent.ie/regionals/wicklowpeople/localnotes/memories-come-flooding-back-35872128.html |title=Memories come flooding back |work=Wicklow People |date=30 June 2017 |publisher=independent.ie |access-date=24 August 2021 |archive-date=24 August 2021 |archive-url=https://web.archive.org/web/20210824025227/https://www.independent.ie/regionals/wicklowpeople/localnotes/memories-come-flooding-back-35872128.html |url-status=live }}</ref> The lower [[Vartry Reservoir]], constructed between 1862 and 1868, is the county's second largest lake.