Three projects in the northeast are set to benefit from major funding as part of the "Shared Island" initiative.
The Government has committed to the construction of the Narrow Water Bridge, which will connect the Cooley Peninsula in Co Louth with the Mourne Mountains in Co Down.
A tender process for the construction works has been carried out and a contract is expected to be awarded in the first half of this year.
The project would see a 280 metre cable-stayed bridge anchored by two towers connecting the A2 Newry to Warrenpoint dual carriageway with the R173 in Omeath.
The bridge would have segregated car, cycle and pedestrian lanes, and will open to allow the passage of boats through and on to the Newry canal.
A further €1.5 million contribution to finish the final section of the Carlingford Greenway is to be made. This would see the construction of a 1.6km boardwalk outside Newry.
Funding is also being provided by the Department of Infrastructure in Northern Ireland, and other sections of the greenway are also supported by other EU funding.
Read more: Govt announces €800m for cross-border projects
€10 million is also being invested in the Battle of the Boyne site in Co Meath. This is part of an overall funding package for the project, once it is finalised.
Oldbridge Estate was bought by the State 24 years ago and was renovated and developed into the Battle of the Boyne visitor centre, which opened to the public in 2008.
An updated conservation management plan commissioned by the OPW in 2022 has now been completed.
The future development of the site includes ensuring overall conservation and protection of the site, considering the potential for deepening North-South community interactions and advancing reconciliation, and contributing to tourism for the Meath and south Louth areas.
The estate welcomed around 500,000 visitors in 2022, while the visitor centre attracted 40,000. Works to expand the offering will be led by the OPW in the coming years.
The region will also likely benefit from a €12.5 million investment in the Dublin to Belfast rail service.
An hourly service would double the current frequency and is expected to be fully in place in the first quarter of 2025.
The announcement was welcomed by Louth County Council today, who said the Narrow Water Bridge would act as a "key catalyst for improved cross border active travel and recreational activities, including the development of greenways, walking trails and park amenities".
Chief Executive Joan Martin said the significant funding will allow Louth County Council to bring this "long standing, transformative project to fruition".
Ms Martin said the bridge would open up new opportunities with huge potential for the local and wider economies.
