Glenasmole

{{Short description|Mountain valley near Dublin, Ireland}}

{{Use dmy dates|date=April 2022}}

{{Infobox landform

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| name = Glenasmole

| other_name = Gleann an Smóil

| type = Valley

| photo = River Dodder - geograph.org.uk - 290235.jpg

| photo_width = 325

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| photo_caption = The valley looking north along the River Dodder, the Bohernabreena Reservoir can be seen in the distance

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| location = County Dublin, Ireland

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| coordinates = {{coord|53.23301|-6.35627|display=inline,title}}

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| range = Dublin Mountains

| part_of = Wicklow Mountains

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| highest_point = Kippure

| highest_elevation = 757 m (2,484 ft)

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Glenasmole ({{langx|ga|Gleann an Smóil}}) is a valley in the Dublin Mountains in the south of County Dublin, Ireland.{{cite web|url = https://www.logainm.ie/en/1417357 | publisher = Placenames Database of Ireland | website = logainm.ie | title = Gleann an Smóil / Glenasmole | accessdate = 2025-05-31 }} The valley itself is around {{convert|200|m|ft|abbr=on}} in elevation and is surrounded by mountains exceeding {{convert|600|m|ft|abbr=on}} in elevation. Kippure, at {{convert|757|m|ft|abbr=on}}, is the highest mountain along the valley ridge and is also the highest point in County Dublin. The River Dodder rises at Kippure and flows through the valley, reaching the sea at Dublin Bay.{{cite report|url= http://www.dublincity.ie/WaterWasteEnvironment/WasteWater/Documents/DodderSEAScopingReport.pdf |title=Strategic Environmental Assessment – Scoping Report |date=June 2008|page=13 |url-status=dead|archive-url= https://web.archive.org/web/20110613153150/http://www.dublincity.ie/WaterWasteEnvironment/WasteWater/Documents/DodderSEAScopingReport.pdf|archive-date=2011-06-13|publisher=Dublin City Council |access-date=2010-08-17}} The Glenasmole Valley is an EU-designated Special Area of Conservation.{{cite web |title=Glenasmole Valley SAC|url=https://www.npws.ie/protected-sites/sac/001209 |website=National Parks and Wildlife Service |accessdate=6 October 2022 |language=en}}

The Dodder feeds the two reservoirs at the centre of the valley, known as the Bohernabreena Reservoirs ({{langx|ga|Taiscumar Bóthar na Bruíne }}). The reservoirs, constructed between 1883 and 1887, supply 18.2 million litres of water per day. Despite being within South Dublin's local authority area, the reservoirs and accompanying waterworks are owned and operated by Dublin City Council.{{cite web|url=https://www.dublinmountains.ie/recreation_sites/glenasmole/|title=Glenasmole|accessdate=31 October 2021}}

File:Bohernabreena Reservoir 2018.jpg

The area around the valley is rural in nature and has a population of 415 according to the 2016 Census. There are no nucleated villages in the valley as most dwellings are one-off houses. The small area encompassing the valley covers {{convert|30|km2|acre|0}}, giving it a population density of 14.9 people per square km, making it the most sparsely populated region in County Dublin.{{cite web|url=https://airo.maynoothuniversity.ie/mapping-resources/airo-census-mapping/national-viewers/roi-census-2016-saps-mapping-viewer|title=AIRO Maynooth 2016 Census Mapping|accessdate=31 October 2021|archive-date=28 April 2021|archive-url=https://web.archive.org/web/20210428225445/https://airo.maynoothuniversity.ie/mapping-resources/airo-census-mapping/national-viewers/roi-census-2016-saps-mapping-viewer|url-status=dead}}