Newry River and River Clanrye (Irish: An Rí) are names for one of the rivers of Ireland; it passes through the city of Newry and empties into Carlingford Lough near Warrenpoint. The River which runs through Newry, forms the historic border between County Armagh and County Down. Some maps call the portion downstream from Newry to the Lough the 'Newry River' and the portion upstream of Newry the 'Clanrye' (as it curls around to its sources in the foothills of the Mourne Mountains in Ulster), but not all sources make this distinction.
The word 'Clanrye' comes from the IrishAn Gleann Rí meaning The King's Valley.
During one of Saint Patrick's exploratory missions to Ireland he set up camp on a sandy stretch of the Clanrye River. Whilst settling himself there he took the decision to plant a yew tree symbolising Ireland’s growing and strengthening faith. It is this story which gave Newry its name, Iúr Cinn Trá: the yew tree at the head of the strand (although this part of the riverbank does not resemble a beach today). A monastery, later replaced in 1144 by a CistercianAbbey, grew up around this yew.