OSNI Open Data - Largescale Boundaries - Townlands

The OSNI Largescale Townlands is a polygon dataset consisting of the Townland boundaries.
Townlands are an ancient method of land measurement found only in Ireland and can be very
important in genealogical research. These small areas of land can vary in size from a few acres
upwards. The data has been derived from OSNI Largescale database and has been topologically
cleansed and attributed to create a seamless dataset.
Publisher name: OpenDataNI
Last updated: 2025-11-19T04:00:24Z