Lough Nacung Upper

{{Short description|Lake in County Donegal, Ireland}}

{{Use dmy dates|date=April 2021}}

{{Use Hiberno-English|date=April 2021}}

{{Infobox body of water

| name = Lough Nacung Upper

| native_name = {{native name|ga|Loch na Cuinge Uachtarach}}

| image = File:Donegal, "Stones, Peat And Rushes At Gweedore" - geograph.org.uk - 1140411.jpg

| caption = View towards Lough Nacung Upper, with Errigal to the left.

| pushpin_map = island of Ireland

| pushpin_label_position = none

| pushpin_map_alt = Location in Ireland

| pushpin_map_caption = Location in Ireland

| image_bathymetry =

| caption_bathymetry =

| location = County Donegal

| coords = {{coord|55.032|N|8.166|W|region:IE_type:waterbody|display=inline,title}}

| lake_type = natural freshwater lake

| inflow = Lough Dunlewey

| outflow = Lough Nacung Lower, to the Clady River

| catchment = {{convert|78.62|km2|abbr=on}}

| basin_countries = Ireland

| date-flooded =

| length = {{convert|2.72|mi|km}}

| width = {{convert|0.38|mi|km}}

| area = {{convert|2.08|km2|abbr=on}}

| depth =

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| elevation = {{convert|59|m|ft|abbr=on}}

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| reference = {{cite web | url = https://www.epa.ie/publications/research/water/Final-Report-(2000-FS1-M1).pdf#page=18 | title = A Reference Based Typology and Ecological Assessment System for Irish Lakes | date = 2006 | pages = 12 | publisher = Environmental Protection Agency (Ireland) | accessdate = 17 August 2022 | url-status = live | archive-url = https://web.archive.org/web/20220726141316/https://www.epa.ie/publications/research/water/Final-Report-(2000-FS1-M1).pdf | archive-date = 26 July 2022}}

}}

Lough Nacung Upper ({{Irish place name|Loch na Cuinge Uachtarach|upper narrowness lake' or 'upper lake of the isthmus}}),{{Cite web|url=http://www.logainm.ie/en/1396517|title=Loch na Cuinge Uachtarach/Lough Nacung Upper|website=Placenames Database of Ireland (logainm.ie)|access-date=6 August 2023}} also known as Upper Lough Nacung, is a lake in Gweedore, a district in the north-west of County Donegal, Ireland.Discovery Series Sheet 1 (Fourth Edition). Ordnance Survey of Ireland (O.S.I.), Dublin, 2012.Patrick McKay, A Dictionary of Ulster Place-Names, p. 101. The Institute of Irish Studies, The Queen's University of Belfast, Belfast, 1999. It connects Lough Dunlewey to Lough Nacung Lower, which drains into the Clady River.{{cite web|url=http://www.4x4sb.com/kayaking/co-donegal-irl/184-lough-nacung-upper-irl|title=Lough Nacung Upper (IRL)|author=Administrator|publisher=|access-date=2015-12-29|archive-url=https://web.archive.org/web/20160304090822/http://www.4x4sb.com/kayaking/co-donegal-irl/184-lough-nacung-upper-irl|archive-date=2016-03-04|url-status=dead}}

Lough Nacung is a Special Area of Conservation.{{cite web |url=http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000140.pdf |title=Fawnboy Bog/Lough Nacung SAC 000140 |date=2016 |work=Conservation Objectives Series |issn=2009-4086|publisher=National Parks and Wildlife Service}}

The name is derived from the Irish {{lang|ga|cuing}}, meaning "lake of the isthmus" or "narrow neck of land (as between two lakes)".{{Cite web|url=http://www.teanglann.ie/en/fgb/cuing|title = Foclóir Gaeilge–Béarla (Ó Dónaill): Cuing}}