Charterhouse to Eashing is a 68.4-hectare (169-acre) biological Site of Special Scientific Interest west of Godalming in Surrey.

[1][2] 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.

[3]