Charterhouse to Eashing is a biological Site of Special Scientific Interest west of Godalming in Surrey. This is a steep valley cut through a broad flood plain. Much of the site is wooded, with areas of tall fen, grassland and standing water. There is a diverse fly population, including several rare species, such as '' Lonchoptera scutellata cranefly'', '' Stratiomys potamida'' and the cranefly '' Gonomyia bifida''.

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