Based in the London English Region.
The TQ18 10 square kilometre grid intersects with the settlements of Acton,Alperton,Belmont - Stanmore,Ealing,Greenford,Hanwell,Harrow,Hayes Hillingdon,Headstone,Kenton,Kingsbury,Little Stanmore,Northolt,Northwick Park,Park Royal,Perivale,Pinner,Queensbury,RAF Northolt,Ruislip,Southall,Stanmore,Stonebridge,Stonebridge Park,Sudbury,Sudbury Hill,Tokyington,Wealdstone & Wembley.
TQ18 is within the post towns of Edgware, Middlesex, Greenford, Middlesex, Harrow, Middlesex, Hayes, Middlesex, London, Middlesex, Northolt, Middlesex, Northwood, Middlesex, Pinner, Middlesex, Ruislip, Middlesex, Southall, Middlesex, Stanmore, Middlesex, Uxbridge, Middlesex & Wembley, Middlesex.
The square is within Brent London Boro, Ealing London Boro, Harrow London Boro & Hillingdon London Boro councils.
The TQ18 national grid square measures 10 km by 10 km and has an area of 1,000 kilometres squared.
The technical term for a 10 km map square is a Hectad.
When this 10 km square is divided into a grid 10 by 10 it gives the next size of grid square. This unit is called a Monad and measures 1km square. 100 monads fit in a 10km square.
Out of the monads generated from square TQ18, 506 are land and -406 are sea. Sea squares are disregarded on this site as they contain no land features.
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| Corner | Latitude | Longitude | Easting | Northing |
|---|---|---|---|---|
| South West Corner | 51.506201 | -0.416365 | 510000 | 180000 |
| South East Corner | 51.506201 | -0.268928 | 520000 | 180000 |
| North West Corner | 51.598116 | -0.416365 | 510000 | 190000 |
| North East Corner | 51.598116 | -0.268928 | 520000 | 190000 |