Published by Tailte Éireann
<div style='text-align:Left; font-size:12pt;'><p><span>The High Water Mark digital dataset is derived from relevant 6 inch and 25 inch Ordnance Maps. The alterations are in accordance with the Boundary Survey Acts Ireland, approved by the Chief Boundary Surveyor and signed off in Privy Council Orders. The dataset also includes changes to HWM brought about by subsequent Maritime Orders. Currently under review. This dataset is provided by Tailte Éireann. </span></p></div>
| License | Creative Commons Attribution 4.0 |
| Created | 2025-08-22 |
| Last Updated | 2025-09-05 |