evidence: Carlingford Lough inlet, Irish Sea verifiedCite [...] Carlingford Lough, inlet of the Irish Sea separating the Carlingford Peninsula of County Louth, Ireland, from the Mourne Mountains of the district of Newry and Mourne, Northern Ireland. The town of Newry is connected with the lough, which is 10 miles (16 km) long and 2–4 miles wide, by the Newry Canal, and the settlements on the lough shores include Warrenpoint, Rosstrevor, Carlingford, and the port of Greenore.