evidence: History of Carlingford Lough Carlingford Lough itself is a glacial fjord or sea inlet in north-eastern Ireland [...] To our bow we have the Haulbowline Lighthouse noting the entrance to Carlingford Lough. The lighthouse was built in 1824 and is described as an elegant tapering stone tower. It is located at the entrance to Carlingford Lough, the nearest land being Cranfield point on the Northern side. She is 112ft high.