Cowpen Marsh (grid reference NZ500529) is a 116.8 hectare biological Site of Special Scientific Interest in County Durham, England, notified in 1966.

This means there is no grouping of SSSIs by Stockton-on-Tees unitary authority, or County Durham which is the relevant ceremonial county .

As such Cowpen Marsh is one of 18 SSSIs in the Cleveland area of search.

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