The people living on the North and South of Ireland fictional border have demonstrated against the demands of the unionist far right as Britain moves closer to a crash exit from the European Union and a remilitarisation of the border area across Ireland from April 12.

Despite suffering another humiliating defeat in the House of Commons on the Withdrawal Agreement she has negotiated with the EU, British Prime Minister Theresa May continues to ignore all other options. That deal is opposed by Tory extremists and the DUP, who are demanding a clean break with the EU and the return of border controls between the two parts of Ireland.

A number of protests are taking place today at border crossings between Louth and Armagh, Cavan and Fermanagh, Monaghan and Tyrone, Donegal and Tyrone, and Donegal and Derry.

Spokesperson for Border Communities Against Brexit, JJ O'Hara, said that two decades of peace efforts are at "real risk" because of Brexit.

"There's so much good work done over the last 20 years, from the Good Friday communities," he said. "So many communities came together, and so many different projects have been developed cross-community and cross-border. This is putting [everything] in jeopardy. It's putting the Good Friday Agreement in jeopardy."

Sinn Féin's Donegal-based Senator Padraig MacLochlainn said Brexit posed a "huge threat" to the border communities and the economies on either side.

"A majority of people in the North voted to Remain and the Tories along with the DUP are ignoring this democratic mandate. Our rights, economy and agreements must be protected," he said.