Waltham Brooks is a 47.4-hectare (117-acre) biological Site of Special Scientific Interest south-west of Pulborough in West Sussex.

[1][2] It is owned and managed by the Sussex Wildlife Trust[3] and is part of the Arun Valley Ramsar site[4] and Special Protection Area.

[5] This is one of the few remaining areas of grazing marsh in the county and it has a rich variety of aquatic flora, including one nationally rare species, the small water-pepper.

Many bird species winter at the site, including three in nationally important numbers, Bewick’s swan, teal and shoveler.

[6] There is access to footpaths through the site.