The King George VI Reservoir sits between Stanwell Moor and Staines upon Thames, south-west of Heathrow, England.

[2] Like its Lower Thames siblings, it is of earthen dam build: a puddled clay lining and embankments from materials excavated on site, particularly ballast (heavier aggregates).

[3] It has been built-up from dry land as the eastern Thames Basin lacked sufficiently watered, largely unpopulated, agriculturally unprized vales to be dammed near to which conveniently coal-supplied treatment works and pipes to London could be built.

[6] This and the Staines Reservoirs, built 1902, receive their input from the Thames at Hythe End, Wraysbury above Bell Weir Lock and the mouth of the Colne Brook.

The reservoirs carry (are habitats for) nationally large wintering populations of tufted ducks, pochard, goosander and goldeneye.