The River Liffey rises in the Wicklow Mountains and flows for 132km through counties Wicklow, Kildare, and Dublin before entering the sea at Dublin Bay. It has several tributaries and divides Dublin between North and South, flowing through towns like Ballymore and Newbridge before reaching Dublin city. The Liffey is used for drinking water, power generation, and historically for transporting goods like Guinness, though now primarily supports recreation like rowing and swimming races.