Mattock River

The Mattock River is a river in

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

. It is a tributary of the

River Boyne The River Boyne ( ga, An Bhóinn or ''Abhainn na Bóinne'') is a river in Leinster, Ireland, the course of which is about long. It rises at Trinity Well, Newberry Hall, near Carbury, County Kildare, and flows towards the Northeast through C ...

. Its source is near

Collon Collon () is a village and townland in the south west corner of County Louth, Ireland, on the N2 national primary road. The village is home to the Cistercian Abbey of New Mellifont, and to Collon House, the ancestral home of the Foster family. ...

(), from where it flows through County Louth towards the southeast until a place west of Drummond Tower in Coolfore where it begins to form the boundary between Counties Meath and

Louth Louth may refer to: Australia *Hundred of Louth, a cadastral unit in South Australia * Louth, New South Wales, a town * Louth Bay, a bay in South Australia **Louth Bay, South Australia, a town and locality Canada * Louth, Ontario Ireland * Cou ...

. Here it turns towards the southwest until Monknewtown where it takes a southeastern direction again before turning roughly east at

Dowth Dowth ( ga, Dubhadh) is a Neolithic passage tomb located in the Boyne Valley, County Meath, Ireland. It is one of the three principal tombs of the ''Brú na Bóinne'' World Heritage Sitea landscape of prehistoric monuments including the large ...

. It joins the River Boyne at

Oldbridge Oldbridge () is a townland near Drogheda in County Meath, Ireland. The area is home to the Boyne Navigation, the Battle of the Boyne Interpretive Centre and the southern half of the Mary McAleese Boyne Valley Bridge (which carries the M1 motorwa ...

in the parish of Drogheda ({{coord, 53.7207, -6.4276). Rivers of County Louth Rivers of County Meath