Vange and Fobbing Marshes are a 164.6-hectare (407-acre) biological Site of Special Scientific Interest in two areas south of Basildon in Essex, England.

[1][2] Vange Marsh is managed by the Royal Society for the Protection of Birds.

[3] The marshes are unimproved coastal grassland, dykes and creeks, with a wide variety of maritime herbs and grasses, some of them nationally rare.

Insects with restricted distributions include the scarce emerald damselfly and Roesel's bush cricket.

[1] There are birds at Vange Marsh such as avocets, common terns and black-tailed godwits.