Irish national grid reference system

The Irish national grid reference system is the system of grid references used in Northern Ireland and the Republic of Ireland. It overlaps the British national grid reference system. In the grid references, Ireland is divided into 20 squares, of 100 kilometres length and 100 kilometres width. Each grid square is given a letter as its name.
 References 
 Ordnance Survey Ireland - History and overview of the system 

Category:Political geography
Category:Geography of Ireland