East Ham was a local government district in the far south west of Essex from 1878 to 1965. It extended from Wanstead Flats in the north to the River Thames in the south and from Green Street in the west to Barking Creek in the east. It was part of the London postal district and Metropolitan Police District.

Wanstead Flats is the southernmost portion of Epping Forest, in Leytonstone and Wanstead, London. The flats and by extension the forest ends at Forest Gate directly to the south. It now falls wholly within the boundaries of the London Boroughs of Redbridge and Waltham Forest, though until 1994 two parts of it were in the London Borough of Newham: one of these was the section between Aldersbrook Road and Capel Road east of the junction between Aldersbrook Road and St Margaret's Road, whilst the other was the strip running along Capel Road between its junctions with Centre Road and Ridley Road. As part of Epping Forest, the Flats is managed by the City of London Corporation.