BorderIrish or @BorderIrish was the pseudonym of an anonymous satirical author, resident on the island of Ireland, who from 2018 to 2020 wrote in the first person about being the 97-year-old 499 km (310 mi) Irish border between the Republic of Ireland and Northern Ireland (i.e. an anthropomorphism), both on Twitter as @BorderIrish and in print with I Am the Border, So I Am (2019);[1] and in particular on the implications of Brexit on the Irish land border.

[6][7] In a December 2018 interview with Austrian newspaper Wiener Zeitung, BorderIrish said (as the border): "I had retired and spent the past 20 years watching the sheep and the clouds.

Everyone had forgotten me, but then Brexit came and suddenly journalists were looking for me and politicians were talking nonsense about me, so I decided to make me heard".

[9] On 31 January 2020, as the United Kingdom left the European Union, BorderIrish announced that he was retiring his Twitter account telling The Irish Times: "It feels like I won the battle and lost the war"; and signing off his Twitter account with "I was the Border, so I was".

[15] In October 2019, BorderIrish released a book titled I Am the Border, So I Am,[1] which was favourably reviewed,[16][17][18] and described by Fintan O'Toole as "among the best satires of the Brexit era",[19] and listed by Alex Clark in the Financial Times "Best audiobooks of 2019".