List of Irish counties by coastline

Additionally, Limerick and southern Kilkenny border the tidal zones of the rivers Shannon and Suir.

Both counties also have active ports at Foynes and Belview, but have no exposed coastline.

Two sources are used: the first is a 1999 study by Brigitte Neilson and Mark Costello of Trinity College Dublin.

[1] The study mapped the low-tide coastline of Ireland and its offshore islands using a Geographic information system.

[2][3][4] The second source is a Coastal Habitat Survey completed by the Heritage Council.

Counties shaded dark blue have an ocean or sea coastline.
Counties shaded light blue have an estuarine or tidal coastline.
Counties shaded green have no coastline.