evidence: Brian McDermott crosses the Border from his Donegal home in Moville every day to get to his job in Derry, but now he worries that the impending departure of the UK from the European Union could threaten not just his job but also where he lives. [...] His experience is typical of many who live and work along the Border. Some 30,000 people cross the Border daily along its 450km length. Half of them do so to travel to work or school, and many of them do so from Donegal into its natural hinterland of Derry. Most are well-educated, and cross the Border for well-paid jobs in education or healthcare. "In terms of work-based commuting, it's all about the northwest," says Justin Gleeson, the director of the All-Island Research Observatory. "One of the key things that's come up regarding the Brexit debate is the question of just how connected we are across the Border, and how people are flowing across the Border. If you imagine those 30,000 people crossing the Border on a daily basis, having a real hard Brexit with border controls slowing that whole movement down would completely change everything.