Thompson Water, Carr and Common

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]

Thompson Water, Carr and Common

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

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.