| Site of Special Scientific Interest | |
 Thompson Water | |
| Location | Norfolk |
|---|---|
| Grid reference | TL 929 956 [1] |
| Interest | Biological |
| Area | 154.7 hectares (382 acres) [1] |
| Notification | 1988 [1] |
| Location map | Magic Map |
Thompson Water, Carr and Common is a 154.7-hectare (382-acre) biological Site of Special Scientific Interest north of Thetford in Norfolk, England. [1] [2] Most of it is managed by the Norfolk Wildlife Trust as Thompson Common. [3] It is a Nature Conservation Review site, Grade I, [4] and part of the Norfolk Valley Fens Special Area of Conservation. [5] It is crossed by the Great Eastern Pingo Trail Local Nature Reserve. [6]
This grassland site, located in the valley of a tributary of the River Wissey, contains a number of pingos—damp, water filled depressions formed by the melting of ice at the end of the last glaciation. It also features a lake called Thompson Water, which— along with its surrounding reed swamp— is important for breeding birds. [7]
The site is open to the public.
