What are the National Ambulance Service Regions/Borders?

Depends on what way you want to look at it. Operational regions are South, North Leinster, and West.

Other things such as control regions, fleet numbering, complaints, community engagement, management etc have different regions within each region.

Every area, from a management perspective, as of very recently, now aligns to the new HSE's Regional Health Areas.

Each area now has a General Manager (Akin to the previous role of Chief Ambulance Officer), there will be 17 District Operations Managers and then ORM's, training officers, tactical managers, etc.