For more on the history of this divide:
Irish national broadcaster RTÉ: https://www.rte.ie/brainstorm/2025/1203/1547100-boundary-commission-1925-centenary-ireland/
British national broadcaster: BBC: https://www.bbc.com/news/uk-northern-ireland-56806404
 

The main artery from Dublin to Belfast – just north of Dundalk 2kms past the Carrickdale Hotel.

Here is the UK’s Border in Ireland: more rurally.

The part of the road at the bottom with the dashed yellow lines is in the Republic. Everything from the sign with the big “60” on it is in Northern Ireland

This is also the border – many sections of the border run down the middle of the road, through farmhouses and warehouses.

In this case the little bit of wall in the bottom-left is in Northern Ireland. Everything from the sign saying “80” is in the Republic

More border:

The line in the tarmac at the bottom is in Northern Ireland. The “80” signs are in the Republic

Oh look it’s the border:

The road with the white line is in the Republic. The point where the line stops is the border.

Peter O'Connor, fiddle, memorial, victims, Northern violence, Dundalk.