The part of the reserve to the north of the Lower Rainham Road is known as Rainham Dock East (RDE) and is the site of the old British Standard Cement Company's works at Motney Hill. To the south of the Lower Rainham Road is the old Rainham chalk pit which supplied chalk to the cement works
As well as the whole site having Local Nature Reserve status, part of Rainham Dock East is a Site of Special Scientific Interest (SSSI), whilst the chalk pit is a Site of Nature Conservation Interest (SNCI) (Now known as 'Local Wildlife Sites')
Since cement production ceased in 1931, both areas have been taken over by nature. The northern part is mainly scrub, with some open ground, a small amount of woodland and a reed bed. The old chalk pit has a small lake (second picture below) with a reed bed, which floods into an area of willow carr. The drier areas and sides of the pit contain woodland and mature scrub, with a small area of glades.
There are few mammals in residence, other than rabbits, squirrels and small rodents, but bird watchers will find the area of interest.