evidence: Carlingford Lough is a glacial fjord which forms part of the border between the Republic of Ireland and Northern Ireland (United Kingdom), with county Down on its northern shore and County Louth on its southern shore. It’s easily reachable from Dundalk, and is one of Ireland’s most beautiful natural spots, flanked by the Mountains of Mourne which famously sweep down to the sea and the Cooley peninsula. People have been flocking to Carlingford Lough for centuries, and the pretty towns that dot its shores, including Warrenpoint, Rosstrevor, Carlingford, and Greenore. If you really want to soak in the natural wonder, you’d be advised to stay in one of the area’s numerous fine B&B’s for example Templetown House, Peggy’s Shabby Chic Cottage, or The Oystercatcher Lodge Guest House [...] Sail across the lough on the Carlingford scenic ferry, which connects Greenore port and Greencastle in County Down. This is a great way to take in the spectacular views of this very special Lough (Ireland has only three glacial fjords, and Carlingford is arguably the most beautiful). Details can be found at carlingfordferry.com