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Dublin is the biggest city in Ireland, but the 3rd smallest county. The county is about 44 square miles.
The county of Dublin is about 921 square kilometres or 356 square miles. The city, which is in the county, is about 115 square kilometres or about 44.4 square miles.
The Dublin Castle is one of the hugest castles in the world. It is up to 124,567 metres high