| St. Catherine's Valley | |
| Aos: | Avon |
| Interest: | Biological |
| Gridref: | ST760725 |
| Area: | 156.1 hectare |
| Notifydate: | 1997 |
| Map: | English Nature |
St. Catherine's Valley 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. E. Ellman in 1927.[1]