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Mahee Castle , also known as Nendrum Castle , is a ruined castle close to the Nendrum Monastery on Mahee Island , near to the western shore of Strangford Lough in the parish of Tullynakill , County Down , Northern Ireland . )
 County Down, Northern Ireland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 County Down, Northern Ireland