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The River Liffey flows through the centre of Dublin. Its major tributaries include the River Dodder, the River Poddle and the River Camac. The river supplies much of Dublin's water and a range of recreational activities. It rises in The Wicklow Mountains and flows 125km.

The O'Donovan Rossa Bridge is a road bridge spanning the River Liffey in Dublin, and joining Winetavern Street to Chancery Place (at the Four Courts) and the North Quays.
Replacing a short-lived wooden structure, the original masonry bridge on this site was built in 1684 as a five-span simple arch bridge, and named Ormonde Bridge. In December 1802 this bridge was swept away during a severe storm.
In 1813 construction started on a replacement bridge — the current structure — a little further west to the designs of James Savage, and it was opened in 1816. It consists of three elliptical arch spans in granite, with sculptured heads, similar to those on O'Connell Bridge, on the keystones. The heads represent Plenty, the Liffey, and Industry on one side, with Commerce, Hibernia and Peace on the other.
Opened as Richmond Bridge (for the Duke of Richmond Lord Lieutenant of Ireland), it was renamed in 1923 for Jeremiah O'Donovan Rossa by the fledgling Irish Free State.