|Location Map ( geo)|
|Distance:||12.8 km (8 miles)|
|Meets:||R135, R122, R108, R132, M50, R107, R809, R105|
The R104 is a west to east route on the northern edge of the city of Dublin – and skirting the county of Fingal – which connects the R135 in Finglas to the R105 in Kilbarrack by way of Santry and Coolock.
The road was re-aligned along St Margaret's Road in Ballymun to accommodate a number of major retail developments. Those developments mostly haven't arrived yet, leaving a road through fields with several sharp bends.