In a three-part series, RTÉ's Cian McCormack travelled along the border to find out how people are weighing up the potential impacts of the consequences of Brexit.
From Dundalk to Donegal, his journey reveals concerns over the known knowns, the known unknowns and the unknown unknowns of Brexit.
The first stop is Dundalk, where there is increasing alarm in the town over the progress of Brexit negotiations.
"Fifteen months ago, Article 50 was triggered. It still hasn't been clarified how it's going to affect the supply chain. And we would be very naive to think that it’s not going to affect Irish manufacturers."
On day two of the series, we hear voices from Cavan, Fermanagh and Leitrim.
"Nobody knows what's coming forward. If a sheep dog comes across the border with me in the back of the Jeep - nobody knows what the hard border's going to bring. Is it that this sheep dog can't come across? Does he have to go into quarantine for so long coming from a non-EU country to an EU country? It's an open book. Nobody knows all this here. But it's scary, scary stuff."
In Donegal, where cross-border tourism is important, people also cite concerns over a return of a hard border.
"The one fear that we have is the hard border, let's be fair about it. I'm old enough to remember when you had to stop at the customs at Belleek to get stamped. God help us if we go back to some similar situation as that. It definitely won't help tourism, there's no doubt about that."