Blo' Norton and Thelnetham Fen
| Site of Special Scientific Interest | |
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| Grid reference | TM019788 |
|---|---|
| Coordinates | 52°22′10″N 0°57′51″E / 52.3695°N 0.9641°ECoordinates: 52°22′10″N 0°57′51″E / 52.3695°N 0.9641°E |
| Interest | Biological |
| Area | 21.03 hectares (0.21 km2; 0.08 sq mi) |
| Notification | 1959 |
| Natural England website | |
Blo' Norton and Thelnetham Fen is a Site of Special Scientific Interest (SSSI) extending across the borders of the English counties of Norfolk and Suffolk. The site is split between the parish of Blo' Norton in Norfolk and Thelnetham in Suffolk and covers an area of 21.03 hectares (52.0 acres).
The site consists of areas of calcareous fen wetland and associated carr woodland and meadow along the Little Ouse river which marks the county boundary. It is notable for being an internationally important site for the rare black bog rush Schoenus nigricans and saw sedge Cladium mariscus plant species.
The site is located on the Norfolk-Suffolk border to the south of A1066 Diss to Thetford road and north of the A143 between Diss and Bury St Edmunds. It is 6 miles (9.7 km) west of Diss, 10 miles (16 km) south-east of Thetford and 14 miles (23 km) north-east of Bury St Edmunds. The Redgrave and Lopham Fen SSSI is 2 miles (3.2 km) east of the site.
The site supports a "very large number of plant species" on the wetter fen areas. Dominant species tend to be black bog rush Schoenus nigricans, saw sedge Cladium mariscus and purple moor grass Molinia caerulea, with species such as fen orchid Dactylorchis praetermissa, devil’s bit scabious Succisa pratensis, long-stalked yellow sedge Carex lepidocarpa, quaking grass Briza media, parnassus Parnassia palustris and a number of rare mosses also found in these areas.
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