County Down is a county in the North East of Northern Ireland. It is bordered by the counties of County Armagh and County Antrim as well as the Irish Sea to the west. Its main settlements include Hillsborough, Holywood, Newcastle, Newry, Newtownards, Ballynahinch, Banbridge, Bangor, Castlewellan, Donaghadee, Downpatrick and Dromore.