High Water Mark - National Water Marks - Ungeneralised - 2024

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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. This dataset is provided by Tailte Éireann

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URL: https://data-osi.opendata.arcgis.com/api/download/v1/items/3c9d84ce76c1498d97d8b9a580a365e3/geojson?layers=0

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