site on 9 March 1998. It is a cross-border site, with the northern shore lying within Northern Ireland (including the lough's more extensive mudflats and a salt marsh), and the southern shore lying in the Republic of Ireland (where the Carlingford Lough Special Protection Area falls within the scope of the National Parks and Wildlife Service). Transport Railway is the nearest station located on the Dublin-Belfast railway line with trains running on the Enterprise between Belfast Central, Portadown and Dublin Connolly, whilst other trains may call at additional stations en route to Belfast Great Victoria Street. Until its closure in the early 1950s, the southern side of the lough was served by the Dundalk, Newry and Greenore (DNG) railway line. Sections of this line now form part of the Carlingford Lough greenway. Navigation The lough is navigable, and its seaward entrance is marked by the Haulbowline Lighthouse, which was built in 1824. There is a deep water cargo port at Greenore, and a smaller fishing harbour at Carlingford. A commercial marina lies north of Carlingford town, close to the start of the greenway. See also List of loughs in Ireland References External links Carlingford.ie - Carlingford and Cooley Tourism Association Omeath.ie - Omeath and Carlingford area information BBC.co.uk - Information on Carlingford Lough Disaster (1916) Special Protection Areas in Northern Ireland Sea loughs of the Republic of Ireland Ramsar sites in Northern Ireland Republic of Ireland–United Kingdom border Transboundary protected areas Important Bird Areas of Northern Ireland Important Bird Areas of the Republic of Ireland Protected areas of County Down Sea loughs of Northern Ireland Landforms of County Louth Landforms of County Down Fjords of Ireland Fjords of the Republic of Ireland