River Swilly

River Swilly at tSúileach
Image of the Swilly River in June 2007
Data
location	County Donegal , Ireland
River system	River Swilly
River basin district	North Western IRBD
source	between Letterkenny and Glenties 54 ° 55 ′ 19 ″  N , 7 ° 58 ′ 23 ″  W.
muzzle	at Letterkenny in Lough Swilly (Atlantic Ocean) Coordinates: 54 ° 58 ′ 33 ″  N , 7 ° 38 ′ 41 ″  W 54 ° 58 ′ 33 ″  N , 7 ° 38 ′ 41 ″  W
length	approx. 35 km

The River Swilly ( Irish At tSúileach ) is a 35 km long river in the Irish County Donegal . It flows through the village of Letterkenny .

The River Swilly is said to be rich in fish and a clean river. It flows into the Lough Swilly estuary, which is 40 km deep .