Loch Lyon
{{Use dmy dates|date=March 2017}}
{{Use British English|date=March 2017}}
{{Infobox body of water
| name = Loch Lyon
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| image = Loch Lyon from An Grianan - geograph.org.uk - 8301.jpg
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| caption = Loch Lyon from An Grianan. Beyond the loch the highest hill is Beinn Dorain.
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| coordinates = {{coord|56.540800|N|4.568|W|region:GB_type:waterbody|display=inline,title}}
| type = freshwater loch, reservoir
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| outflow = River Lyon
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| basin_countries = Scotland
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| length = {{convert|2.81|km|mi|abbr=on}}
| width = {{convert|0.40|km|mi|abbr=on}}
| area = {{convert|492.3|ha|acre|abbr=on}}
| depth = {{convert|25|ft|m|abbr=on}} before construction of dam.
| max-depth = {{convert|100|ft|m|abbr=on}} before construction of dam.
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| shore = {{convert|21.2|km|mi|abbr=on}}
| elevation = {{convert|344|m|ft|abbr=on}}
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| pushpin_map = Scotland Perth and Kinross
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Loch Lyon (Scottish Gaelic, Loch Lìobhann)[http://www.gaelicplacenames.org/ Loch Lìobhann/Loch Lyon]. Ainmean-Àite na h-Alba. Accessed 25 March 2017. is a freshwater loch in Glen Lyon, located in Perthshire, Scotland, which feeds the River Lyon, a tributary of the River Tay.{{cite book |first1=John |last1=Murray |first2=Lawrence |last2=Pullar|title=Bathymetrical Survey of the Fresh-Water Lochs of Scotland, 1897-1909 Lochs of the Tay Basin Volume II - Loch Lyon|url=https://maps.nls.uk/bathymetric/text/page/915|date=1910 |publisher=National Challenger Officer|location=National Library of Scotland|page=72 |accessdate=24 July 2018}}{{PD-notice}}{{cite web |title=Loch Lyon |url=http://www.britishlakes.info/23624-loch-lyon-tayside |website=British Lakes |publisher=British Lakes |accessdate=24 July 2018}} Loch Lyon lies in Glen Lyon, that is the longest enclosed Glen in Scotland, stretching over {{convert|30|mi|km|-1|abbr=off}} from Fortingall in the east to Loch Lyon in the west. Sir Walter Scott described Glen Lyon as the longest, loneliest and loveliest glen in Scotland.{{cite book|author1=Jen Benson|author2=Sim Benson|title=The Adventurer's Guide to Britain: 150 incredible experiences on land and water|url=https://books.google.com/books?id=gChVDwAAQBAJ&pg=PA20|accessdate=24 July 2018|date=17 May 2018|publisher=Bloomsbury Publishing|isbn=978-1-84486-520-8|page=20}}
Reservoir
The original natural loch was much expanded by a hydro-electric dam, part of the North of Scotland Hydro-Electric Board's Breadalbane scheme.