The Queen Mary Reservoir is one of the largest of London's reservoirs located in the Staines

Staines

Staines is a Thames-side town in the Spelthorne borough of Surrey and Greater London Urban Area, as well as the London Commuter Belt of South East England. It is a suburban development within the western bounds of the M25 motorway and located 17 miles west south-west of Charing Cross in...

/Sunbury

Sunbury

Places called Sunbury include:Australia*Sunbury, Victoria**Sunbury Downs College**Sunbury Pop Festival Canada*Sunbury County, New Brunswick...

 area of West London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

 within the borough of Spelthorne

Spelthorne

Spelthorne is a local government district and borough in Surrey, England. It includes the towns of Ashford, Laleham, Shepperton, Staines, Stanwell and Sunbury...

 in Surrey

Surrey

Surrey is a county in the South East of England and is one of the Home Counties. The county borders Greater London, Kent, East Sussex, West Sussex, Hampshire and Berkshire. The historic county town is Guildford. Surrey County Council sits at Kingston upon Thames, although this has been part of...

. It lies south of the A308

A308 road

The A308, is a road in England in two parts.*The Brompton to Fulham section starts at the A4 road by Brompton Oratory and Victoria and Albert Museum, and follows Fulham Road South West to Chelsea and Westminster Hospital, where it jumps south a block to follow Kings Road to meet the A219 road in...

 and west of the M3 motorway

M3 motorway

The M3 motorway runs in England for approximately from Sunbury-on-Thames, Surrey, to Southampton, Hampshire and forms an unsigned section European route E05. It is dual three lanes as far as Junction 8 near Basingstoke and then dual two lane until Junction 9 near Winchester and then dual three...

. The reservoir covers 700 acres (2.8 km²) and lies 45 ft (13.7 m) above the surrounding area.

Designed by John Watson Gibson

John Watson Gibson

Sir John Watson Gibson was an English civil engineer, key in developing the water supply infrastructure in the former British Empire, and instrumental in the design of Mulberry Harbour used in the Normandy landings.-Early life and career:...

 for the Metropolitan Water Board in 1931, the reservoir today is owned by Thames Water

Thames Water

Thames Water Utilities Ltd, known as Thames Water, is the private utility company responsible for the public water supply and waste water treatment in large parts of Greater London, the Thames Valley, Surrey, Gloucestershire, Wiltshire, Kent, and some other areas of in the United Kingdom...

. 200000000 gallons (909,218,000 l) of water are pumped into the reservoir each day from an inlet on the River Thames

River Thames

The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

 at Laleham

Laleham

Laleham is a village in the borough of Spelthorne, in the county of Surrey in South East England and adjoins Staines. It is within the historic boundaries of Middlesex. To its south is Laleham Park by the River Thames, across green belt farmland to its north and south east are Ashford and...

 between Chertsey Lock

Chertsey Lock

Chertsey Lock is a lock on the River Thames in England, on the northern Middlesex bank near Chertsey in north-west Surrey. The lock is about 200 yards upstream of the picturesque Chertsey Bridge...

 and Penton Hook Lock

Penton Hook Lock

Penton Hook Lock is a lock on the River Thames in England situated on the northern "Middlesex" bank near Laleham, Surrey.The lock cuts across a large loop or hook in the river, creating Penton Hook Island There is a large marina in the disused gravel pits connected to this loop...

.

The Queen Mary Sailing Club is a members sailing club on the reservoir. It owns a subsidiary company Queen Mary Sailsports, bringing all training operations "in house". The postal address for the club is in Ashford

Ashford, Surrey

Ashford is a town almost entirely in the Surrey borough of Spelthorne in England, with a small part falling within Greater London. It is a suburban development situated 15 miles west south-west of Charing Cross in London and forms part of the London commuter belt...

, Middlesex

Middlesex

Middlesex is one of the historic counties of England and the second smallest by area. The low-lying county contained the wealthy and politically independent City of London on its southern boundary and was dominated by it from a very early time...

.