The government legislation that defines the R325, the Roads Act 1993 (Classification of Regional Roads) Order 2012 (Statutory Instrument 54 of 2012), provides the following official description:
Glentavraun, County Mayo — Cloonarragh, County Roscommon
Between its junction with N83 at Glentavraun in the county of Mayo and its junction with R361 at Cloonarragh in the county of Roscommon via Sonvolaun and Kilmovee in the county of Mayo: Crunaun, Kiltybranks and Loughglinn in the county of Roscommon.[1]