The Staines Reservoirs are two large pumped storage reservoirs sitting to the east of the King George VI Reservoir near Heathrow Airport in Surrey within the Colne Valley regional park. The village of Stanwell is mainly to the north east, and the town of Staines is to the south.
Both adjoin, west, the A3044. The south one adjoins the A30 where the road is bypassed by the intra-M25 motorway network but is a trunk road, maintained by National Highways. They were completed in 1902.
Spelthorne is a local government district with borough status in Surrey, England. Its council is based in Staines-upon-Thames; other settlements in the area include Ashford, Sunbury-on-Thames, Shepperton, Stanwell and Laleham. It is named after the medieval Spelthorne Hundred which had covered the area.
The borough is largely urban; although outside the boundaries of Greater London, it is almost entirely inside the M25 motorway which encircles London. The borough contains several large reservoirs, including the Wraysbury Reservoir, Staines Reservoirs and Queen Mary Reservoir, which all supply fresh water to London and surrounding areas.
Stanwell is a village in the Spelthorne district, in Surrey, England. It is 16 miles (26 km) west of central London. A small corner of its land is used as industrial land for nearby Heathrow Airport. The rest of the village is made up of residential and recreational land. Historically part of the county of Middlesex, it has, like the rest of Spelthorne, been in Surrey since 1965. The village is to the south of the cargo-handling area of Heathrow Airport and to the east of the Staines Reservoirs. Stanwell is the northernmost settlement in Surrey,bordering Berkshire and Greater London.
Its recognisable extent has been substantially cut three times – all in the 20th century. Land was taken for reservoirs in about 1900; a few decades later land was taken into Heathrow Airport; and in 1995, after the completion of the M25 motorway, the settlement of Poyle (beyond Stanwell Moor) was detached from the Borough and reassigned to Colnbrook in the Borough of Slough.