An Dun

{{Short description|Iron Age fort in Scotland}}

{{Infobox ancient site

|name = An Dun

|native_name =

|alternate_name =

|image =An Dun broch, Loch Ardbhair - geograph.org.uk - 1202995.jpg

|alt = a wide ovaloid linear mound of stones, up to 2 metres high with grass within, emanating from which is a low straight single course stone wall, all on a seaweed-covered rocky beach with low hills in the background

|caption = An Dun, Loch Ardbhair

|map_type = Scotland Highland

|map_alt = map of the Highland council area of Scotland, bordered by seas and parts of immediate southern and eastern council areas, depicting some roads, lakes and watercourses

|map_size =

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|coordinates = {{coord|58.249614|-5.122025|type:landmark_region:GB|display=title, inline}}

|type = Broch

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|notes =

|designation1 = Scheduled Monument

|designation1_offname = An Dun, broch 800m SSW of Ardvar, Loch Ardbhair

|designation1_type = Prehistoric domestic and defensive: broch

|designation1_criteria =

|designation1_date = 14 October 1938

|hes =SM1832

}}

An Dun is an Iron Age broch or dun at the south-east of Loch Ardbhair, Highland, Scotland, UK.

An Dun stands on an isolated rock at the south end of Loch Ardbhair, a sea inlet, and on its eastern shore, about {{convert|100|foot}} from the mainland, to which it is connected by a rough causeway of boulders, now part displaced. The broch is only approachable at low tide, and at high water there is little space between the edge of the rock and the base of the building. It is a dry-built circular construction with an interior diameter of {{convert|24|ft}}, the wall being {{convert|10|ft|6|in}} thick near the base. The entrance passage is from the south, only {{convert|2|ft}} wide at the interior end, and remains to a height of {{convert|3|ft|6|in}} on the left side. Only one or two of the lowest courses of the outside wall of the building remain visible in places, and the rest is concealed by ruins. The interior has probably been cleared of debris, and there the wall exists to a height of {{convert|7|ft|4|in}}.{{cite book|title=Second Report and Inventory of Monuments and Constructions in the County of Sutherland|last=Royal Commission on the Ancient and Historical Monuments and Constructions of Scotland |publisher=HMSO | date=1911 | page=2 | url=https://archive.org/details/secondreportinve01roya/page/2/mode/1up?view=theater}} {{Source attribution}}

A 1911 survey of the broch reported that "there are no signs of chambers in the walls, nor of galleries, the building is poor, the stones are not carefully selected and laid, and the numerous interstices are packed with small angular fragments". A later, 1980, appraisal notes that "reservations on it being a broch are caused by its small size, and absence of evidence of intra-mural chambers. On balance it is more likely to be a broch."{{cite web|title=An Dun, Loch Ardbhair|website=Canmore|url=https://canmore.org.uk/site/4550/an-dun-loch-ardbhair |accessdate=28 October 2022}}

An Dun was designated a Scheduled Monument on 14 October 1938.{{cite web|title=An Dun,broch 800m SSW of Ardvar,Loch Ardbhair |website=Historic Envieronment Scotland |url=http://portal.historicenvironment.scot/designation/SM1832 |access-date=28 October 2022}}