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Northern Ireland's OSNI Largescale Townlands dataset contains polygon boundaries for townlands, an ancient land measurement system unique to Ireland. The data was derived from the OSNI Largescale database in 2013 and has been topologically cleansed to create a seamless spatial dataset. Townlands vary in size from a few acres upwards and are particularly important for historical and genealogical research.
The Esri REST API endpoint for this data will not open directly in a web browser but can be used in desktop GIS software and webmaps.