The Brexit vote for UK withdrawal from the EU has put the constitutional future of Northern Ireland centre-stage once again. Beyond the Border is an authoritative, timely and up-to-date guide to the provisions of the Good Friday Agreement. A compelling and accessible exploration of how the Agreement can be upheld despite Brexit uncertainties, and implemented despite political deadlock, this book powerfully argues for the permanence of the Agreement and its cross-community approach, even in the event of the achievement of Irish unity. It comprehensively explains the radical implications of the principle of parity of esteem between the traditions and how the conflicting aspirations of nationalists and unionists can be accommodated. At a time of seismic constitutional transition it outlines the milestones on the pathway to a united Ireland by consent as envisaged by the Agreement. The Good Friday Agreement was endorsed by 71 percent of voters in Northern Ireland and by 94 percent in the rest of Ireland. Despite huge difficulties in implementation, this book contends that the Agreement remains a cornerstone of Ireland's constitutional settlement. Beyond the Border is a vital and even-handed exploration of how the Agreement provides a peaceful path towards resolving Ireland's ultimate constitutional dilemma.