Revised version of a paper presented at a study group meeting on “Planning for and working in Border areas”, Derry, 13 October 2005, as part of the programme Mapping frontiers, plotting pathways: routes to North-South cooperation in a divided island.Traditionally grasped as a division, the border between the Republic of Ireland and Northern Ireland is increasingly understood as forming an individual unit made up of multiple connections. This paper analyses this border as assumed, and tries to develop its meaning within a European setting. The academic focus is on regional studies, political geography, spatial planning and border literature, and the paper puts forward an approach to national and regional borders as whole entities to be pla...