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River Wensum SSSI : ウィキペディア英語版 | River Wensum SSSI
The River Wensum SSSI is a 'whole river' Site of Special Scientific Interest located on the River Wensum that flows through the English county of Norfolk. The river was designated a SSSI in 1993 and a Special Area of Conservation SAC in 2000. It covers of the Upper Wensum from its source close to South Raynham downstream to Hellesdon Mill an area of .〔(English Nature ) Retrieved 26 April 2011〕 ==Description== The Wensum's upper reaches are fed by springs that rise from chalk and was selected as being one of the best examples of a lowland chalk and oolite river type III. There are four species of European importance in the river; the bullhead, the brook lamprey, the white-clawed crayfish and Desmoulin's whorl snail.〔〔(Wensum Valley Trust ) Retrieved 5 May 2011〕 In addition the river holds 100 plant species including water crowfoot and water starwort〔
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