The Stain Hill Reservoirs in London, England with embankments occupy 0.175 square kilometres (43 acres).
They are a pair which sit high between others; Kempton Nature Reserve; riverside houses in Sunbury-on-Thames; and a low area of flood meadow to the west alongside the closing stretch of the Port Lane (or Felthamhill) Brook.
[1] These storage lakes were built by the Southwark and Vauxhall Waterworks Company and – in use – are managed by Thames Water.
The lakes narrowly exceed the embankments in size and have significant populations of moulting and wintering waterfowl, particularly where the water is shallow and marginal vegetation has developed.
Dry concrete upper banks support nationally-scarce "tower mustard" (arabis glabra), a UK Biodiversity Action Plan Priority species.