| Site of Special Scientific Interest | |
.JPG) Common butterwort grows at Mar Field Fen[nb 1] | |
.svg)  Location within North Yorkshire | |
| Location | North Yorkshire |
|---|---|
| Grid reference | SE222819 |
| Coordinates | 54°13′56″N 1°39′39″W / 54.2323°N 1.6609°W |
| Interest | Biological |
| Area | 8.8809 hectares (0.08881 km2; 0.03429 sq mi) |
| Notification | 2 October 1988 |
| Location map | Magic Map (Defra) |
Mar Field Fen is a Site of Special Scientific Interest, or SSSI, north of Masham, North Yorkshire, England, in a rural area known as Marfield. It is situated on land containing woodland carr, fen, spring-fed marshy grassland and drier calcareous grassland, between the River Ure to the east and Marfield Wetland nature reserve to the west. As "one of the best examples of fen habitat in the Vale of York," it is a protected habitat for a variety of plants, including the common butterwort, a carnivorous plant.[1] There is no public access to this site.
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