Located in Dublin, it forms a semi-orbital route around the south of the city.

As of 2007, clockwise, it starts at the N31 at Temple Hill in Blackrock and ends at a junction with the N4 at Palmerstown.

The Liffey Valley Shopping Centre, and The Square, Tallaght, two of the busiest shopping centres in Ireland, are both located just off the route.

The Belgard Road section, running between the N7 at Newlands Cross and the N81 at Tallaght, is a standard dual carriageway and the main thoroughfare in the Tallaght area.

The official description of the R113 from the Roads Act 1993 (Classification of Regional Roads) Order 2012 [1] reads: As of April 2018 based and based on the Ordnance Survey map of Dublin (Sixth Edition, updated Sept 2005) and the 2006 legislation defining a new route, the former R113 route was changed to: