Frontier within the European Union in Ireland before 31st January 2020: the Republic of Ireland in green and the United Kingdom (including Northern Ireland) in pink, with the British flag in Northern Ireland and the flag of Ireland in the Republic, together with the flag of Europe on both sides of the border. (The international border is now also the frontier of the European Union and the European Economic Area.)
This file was derived from:

 Counties of Ireland.svg
Flag of the United Kingdom (2-3).svg
Flag of Ireland (3-2).svg
Flag of Europe.svg
Own work based on: Counties of Ireland.svg: , Flag of the United Kingdom (2-3).svg: , Flag of Ireland (3-2).svg:   and Flag of Europe.svg: