R315 road
Bóthar R315
Entering Moygownagh on the R315
Route information
Length	41.7 km (25.9 mi)
Location
Country	Ireland
Primary destinations	County Mayo Pontoon (R310 road) Terrybaun Crosses the Addergoole River Lahardaun Crosses the Castlehill River Castlehill Ballybrinoge (R316 road) Crossmolina (N59 road) Crosses the Deel River Crosses the Toreen River Moygownagh Crosses the Owenmore River Crosses the Duvonwen River Garranard Crosses the Belladooan River Ballycastle (R314 road)
Highway system
Roads in Ireland Motorways Primary Secondary Regional

The R315 road is a regional road in County Mayo in Ireland. It connects the R310 road at Pontoon to the R314 road at Ballycastle, 41.7 kilometres (25.9 mi) away (map of the route).^[1]

The government legislation that defines the R315, the Roads Act 1993 (Classification of Regional Roads) Order 2012 (Statutory Instrument 54 of 2012), provides the following official description:

Pontoon — Crossmolina — Ballycastle, County Mayo

Between its junction with R310 at Pontoon and its junction with N59 at Main Street Crossmolina via Terrybaun, Lahardaun, Ballybrinoge; and Mullenmore Street at Crossmolina all in the county of Mayo

and

between its junction with N59 at Erris Street Crossmolina and its junction with R314 at Ballycastle via Church Street at Crossmolina; Stonehall, Moygownagh and Ballinglen all in the county of Mayo.^[1]