evidence: Carlingford Lough sits right between Northern Ireland (left) and the Republic of Ireland [...] Carlingford Lough – an estuary that forms part of the border between the county of Down in British-run Northern Ireland and Louth in EU member Ireland – is one of two waterways that present particularly complex issues as Britain removes itself from the EU over the next two years. [...] Carlingford LoughNorthern IrelandBrexitEuropean UnionBritainIrish RepublicRepublic of IrelandIrelandLondonderry