Royal Canal 12th Lock
This stretch of the canal runs from the 12th Lock at Castleknock to the 10th lock at Ashtown near the Phoenix Park. It passes under the M50 motorway interchange for Blanchardstown and Castleknock. It is an easy walk along the canal. There is parking available on the street near the 12th lock. From here you can walk in either direction toward Collmine or towards Ashtown. Parking can be found here: 53.382748, -6.366006 .
Alternatively you can access the Royal Canal at Binns Bridge