River Derry

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River Derry An Doiríoch
The Derry flows under Clonegal Bridge
Etymology	dairgech, "planted with oaks"[1]
Physical characteristics
Source
• location	East of Eagle Hill, near Hacketstown, County Carlow
• elevation	349 metres (1,145 ft)
Mouth	River Slaney
• location	Kildavin, County Carlow
Length	34 kilometres (21 mi)
Basin features
River system	River Slaney

The River Derry (Irish: An Doiríoch) is a large river in the southeast of Leinster, Ireland, a tributary of the River Slaney. It rises just south of Hacketstown, County Carlow. It flows southeast to Tinahely, being accompanied by the R747 regional road for the distance.

South of Tinahely it turns sharply and flows southwest through Shillelagh, briefly forming the border between County Wicklow and County Wexford, before becoming the border between County Wexford and County Carlow.

It flows under Clonegal Bridge at a point where it divides Clonegal, County Carlow to the west from Watch House Village, County Wexford, to the east. A few kilometres further downstream it flows into the River Slaney.

Derry Water River is a separate tributary, which rises near Tinahely and flows north-eastwards to form the Aughrim River.

• Rivers of Ireland

• "The River Derry From Source to Slaney" (PDF). clonegalkildavin.ie.