River Poddle
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The River Poddle rises in Fettercairn, Tallaght, flows through Templeogue and eventually into the Liffey near Wood Quay.
Formerly they met at a place known as the Dubh Linn (black pool), a place now the site of the Coach house and Castle Gardens of Dublin Castle - this may have been the origin of Dublins name.
The river formed an early supply of water to the city, as the Liffey was tidal where they met. By the 13th century the water supply was inadequate and a deal was made in 1244 with the Priory of St. Thomas to divert water from the Dodder to the Poddle to increase the water flow.
Nowadays much of the lower course of the Poddle is in a culvert under city streets.