Back سويلى ARZ River Swilly CEB Суилли (юханшыв) CV Swilly Danish River Swilly German Swilly ibaia Basque Swilly (fleuve) French An tSúileach Irish Río Swilly Galician Svilis Lithuanian
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| River Swilly | |
|---|---|
 The mouth of the River Swilly near Letterkenny | |
| Native name | An tSúileach |
| Location | |
| Country | Ireland |
| Physical characteristics | |
| Source | |
| • location | Glendore Mountain, County Donegal |
| • elevation | ~15.2 m (50 ft) |
| Mouth | |
• location | Atlantic Ocean at Lough Swilly |
| Length | ~41.8 km (26.0 miles) |
The River Swilly (Irish: An tSúileach) is a river in County Donegal, Ireland, which flows in an eastern direction through Letterkenny. Letterkenny, the largest town in County Donegal, is built on the river and became the first crossing point on the river in the 17th century.