Béal Deirg (anglicized as Belderg or Belderrig)Placenames Database of Ireland is a Gaeltacht village and townland in County Mayo, Ireland.Index of Belderrig. Golden Langan. Accessed 28 July 2012. At Belderrig Harbour there is a Mesolithic / Neolithic site dating to 4500-2500 cal. BC. The Céide Fields archaeological site lies about 6 km to the east of Belderrig.

See also Behy court tomb, a megalithic tomb within the Céide Fields complex List of towns and villages in Ireland

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