Killarney National Park in Co Kerry has been paired with Glacier National Park in the US state of Montana.
An agreement signed between Ireland and the United States makes the two sites "sister parks" and allows for the exchange of ideas about how best to manage the amenities.
There will be collaboration on a variety of shared challenges such as high visitor numbers, controlling exotic and invasive species, working with local communities, and ecological monitoring.
The agreement was signed today at a virtual ceremony attended by the Minister for Housing, Local Government and Heritage Darragh O'Brien who said the deal would involve establishing closer links between Killarney National Park and Glacier National Park.
"In doing so we will enrich the experience and capacity of the personnel of both parks through exchanges of staff and best practices," Mr O'Brien said.
"The collaborative nature of this partnership provides an excellent opportunity to exchange lessons learned related to recreation, preservation and resource management," said Shawn Benge, Deputy Director of the US National Park Service.
Cathaoirleach of the Seanad, Fianna Fáil Senator Mark Daly, worked with the US Department of the Interior on the agreement which lasts for five years and may be extended or modified by the participants.
The new sister park relationship joins more than three dozen that exist between US national parks and national parks and protected areas in other countries.