Westminster seats to be cut to 16
Northern Ireland will lose two MPs in the next elections as part of a reform of representation at Westminster.
Constituency lines will be redrawn for the 2015 poll, the Boundary Commission for Northern Ireland said.
It is part of a UK-wide reduction in the number of MPs from 650 to 600. Northern Ireland will have 16 seats instead of 18.
The commission will put its final recommendations to the Northern Ireland Secretary by October 2013.
Liz Benson, secretary to the commission, said: "With the new rules placing great emphasis on broadly achieving equal numbers of electors in each constituency, the review will result in significant changes."
The next step will be publication of the commission's provisional proposals for the new boundaries for public consultation towards the end of the year.