St. Catherine's Valley (grid reference ST760725) is a 156.1 hectare biological Site of Special Scientific Interest southwest of the village of Marshfield, South Gloucestershire, notified in 1997.

At the Marshfield end of the valley, a large naturalised population of Dragon's Teeth (Tetragonolobus maritimus), a species not native to Britain, is present; it was first found by Rev.

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