The border between Northern Ireland and the Republic of Ireland and how it will operate, is one of the three main areas of discussion in the first phase of Brexit negotiations . This paper sets out the different UK and EU negotiating positions as well as how they both pledge to honour the Good Friday Agreement, and what this pledge commits both sides to. It looks at how the Northern Irish devolved government is inputting into the talks, and how the confidence and supply deal between the Conservative party and the DUP might impact on the negotiations. This paper explores how people will move between the two countries, and how the Common Travel Area might be maintained. It also looks at the complexities of avoiding a 'hard border', the stated position of both the EU and the UK, while still adhering to EU rules on moving goods between itself and countries outside the Single Market and Customs Union.