Dún Garbháin · Co. Waterford
Where the Greenway ends, the harbour starts, and the Gaeltacht is the next parish over.
Dungarvan is the working capital of West Waterford - a market town and a harbour town and, since 2017, the place the Greenway delivers you to. Ten thousand people, give or take. The Colligan river meets the bay at the foot of King John's Castle, and the town is laid out on a grid behind it: Grattan Square in the middle, the quays on the water, the Old Market House on Lower Main Street.
The geography is unusual for the Irish southeast. You have a Gaeltacht next door (An Rinn, across the causeway), the Wild Atlantic Way running through the middle, the Comeragh Mountains visible from the square, and a 46-kilometre rail-trail bringing day-trippers from Waterford City. Most Irish towns this size do one thing. Dungarvan does four, and the four take turns.
What it isn't: a tourist town pretending to be authentic. The Tannery has been here since 1997 and Paul Flynn still runs it. The Anchor on Davitt's Quay still does sessions on a Monday. The Local on Grattan Square is owned by a Danú piper. None of this is staged. The food festival in April is real because the producers around the bay are real - the cheese-makers, the brewers, the fish coming off Helvick boats.
Stay two nights. One for the Greenway (do it east-to-west and finish at a pint; the train doesn't run from Waterford anymore so plan the bike-shuttle in advance). One for the Ring loop and an evening on the quays.