The walkway/cycle track extends along the Old Passage Railway line from The Marina at the northern end to Rochestown at the southern end . The distance from the Marina to the Rochestown bridge is 3 kilometers. A branch of the walk leaves the Railway Line near this bridge and veers eastward towards Lough Mahon skirting the Douglas River estuary for a further two kilometers, returning onto the Skehard Road near Ringmahon Point. There are fine views of the harbour from the coast walk, especially of picturesque Blackrock Castleharbour from the coast walk, especially of picturesque  Blackrock Castle.