The River Derg is a small river in Ireland. The river has its source in Lough Derg, in County Donegal, Republic of Ireland, and it flows into County Tyrone, Northern Ireland, east through Castlederg to join with the River Strule to form the River Mourne. The upper reaches of the catchment are characterised by peatland, while the lower reaches flow predominantly through farmland.Derg Lough Foyle The River Derg's length is .Ordnance Survey of Ireland: Rivers and their Catchment Basins 1958 (Table of Reference)
The River Derg is known for its salmon, grilse and sea trout.
See also Rivers of Ireland
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