>> These fields of Birdsong were once a fortress frontier in Northern Ireland's troubles. Blacklion village is in the Republic of Ireland on its door step Belcoo in Northern Ireland. Now there's a new flashpoint in town the UK potentially leaving the EU and what it might mean for the border.
I'm Morris's reporter Jacob Reeves in this Northern Ireland. If we'll just take a few steps over here. I'm now officially on Irish territory. It's a bit of a blur boundary that over the years have allowed for increased movement of goods and people. But in the event of a brevity, this and the remainder of Northern Ireland frontier of the Republic of Ireland we've become Britain's only land border with the EU.
The remain campaign stretch border patrols will have to be implemented if the UK leaves. A view shared by official on the Irish Republic side.>> Whether it involves the return of checkpoints or not we don't know. All we do know it that the Irish Revenue commissioners are looking at the implications of a.
>> The campaigners highlight a border agreement struck between Britain and Ireland before they both entered the EU and say the specter of instability is scare mongering. But few know what it might mean for vital regional economies. As an example of cross border trade, you can't get much more potent than here in.
Those hills over there in the distance are Irish territory and it's the success or economic cooperation over the last decade that's helped rejuvenate this area. But, its troubled past isn't all that historic and some, like the representative of local commerce, fear for the future.>> The movement of people would have to be regulated and checked.
As well in the movement of goods. And that has enormous implications for this place.>> At the height of the troubles, Newry and the surrounding South Armagh area was the most militarized in Northern Ireland, with a majority Irish Catholic population. Here, the last British Army watch tower came down in 2003.
Now eyes are fixed on the very uncertain few weeks, perhaps years.