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Annsborough is a small village in County Down which is one of the main residential areas in Castlewellan, Northern Ireland. It is situated on the A25 road between Downpatrick and Newry, about 0.8 kilometres to the east of Castlewellan and 17 kilometres to the south west of Downpatrick. It had a population of 593 in the 2001 Census. The village is situated within the Mourne Area of Outstanding Natural Beauty.