The 310 mile border chopping by means of Eire at present separates the Republic from Northern Eire.
Nevertheless it’s additionally the one border on the earth (so far as we all know) to have its very personal Twitter deal with.
@BorderIrish arrived on the social media platform in February and has been trolling the Brexit negotiations ever since.
The account has over 55,000 followers, together with the Irish Prime Minister Leo Varadkar and has even printed its personal satirical Penguin youngsters’s e book.
The person behind the account, who desires to stay nameless, has lived on each side of the border.
He instructed Radio 1 Newsbeat that he wished to inject a little bit of humour into Brexit, in addition to some a lot wanted information.
So who higher to ask concerning the historical past of the border, the backstop and why it is develop into Theresa Could’s largest Brexit headache:
Sorry to ask… however how outdated are you?
I am about 97 years outdated.
I used to be meant to be non permanent after I was invented, however I have been right here ever because the Irish Free State and Northern Eire have been established.
I preserve them aside, however type of maintain them collectively too.
So why are we listening to a lot about you now?
I’ve virtually disappeared through the years, however now the UK is attempting to depart the EU, I will be the UK’s solely land border with the EU.
That is very thrilling for me, clearly, and includes loads of time on Duolingo studying Estonian.
Nevertheless it’s additionally a bit disruptive politically, as a result of it means I might need to be a tougher border than I’m now.
A tough border – seems like your teenage years…
In my early years I used to be exhausting as a result of I had customs posts. There have been males in uniforms holding up their arms and stopping automobiles and looking out them for meals.
Then when the Troubles got here within the 1970s, the boys in uniform have been troopers and I had heavy checkpoints and military watchtowers.
However now you are smooth in your outdated age?
Slowly, within the 1990s, the Peace Course of occurred.
When the Good Friday Settlement was signed in 1998 I used to be capable of soften as a result of the violence pale away – principally.
And being within the EU, together with the Frequent Journey Space, meant there wasn’t a lot want for any checks on folks or issues crossing over me.
Now I solely have a ceremonial perform. I am so invisible that generally I take a day without work and no-one notices I am not there.
Inform us about your new greatest buddy, the backstop?
When Brexit got here alongside and the British authorities determined it was going to depart the one market and the customs unions the politicians ran round like mad looking for a method to preserve me as I’m.
The backstop is like an insurance coverage coverage which signifies that I can not be messed round with.
Not everybody likes it. I did not need it, however I would fairly have it than not have it.
Theresa Could says she desires you to be “sensible” in future. Did that damage your emotions?
That is fairly insulting actually, is not it?
I’ve managed to be right here and but be invisible for 20 years.
And by doing that I’ve helped preserve the peace in Northern Eire and Eire.
That is greater than sensible – that is a miracle.