Based in the North West English Region.
The SD40 10 square kilometre grid intersects with the settlements of Barrow Nook,Bickerstaffe,Blaguegate,Bowker's Green,Brighouse Green,Crank,Crawford,Four Lane Ends,Kirkby,Lathom,Melling Mount,Newburgh,Ormskirk,Park Hill,Rainford,Rainford Junction,Royal Oak,Skelmersdale,Stanley Gate & Westhead.
SD40 is within the post towns of Liverpool, Lancashire, Ormskirk, Lancashire, Skelmersdale, Lancashire, St. Helens, Lancashire & Wigan, Lancashire.
The square is within Knowsley District, Sefton District, St. Helens District & West Lancashire District councils.
The SD40 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 SD40, 434 are land and -334 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 | 53.493283 | -2.907763 | 340000 | 400000 |
| South East Corner | 53.493283 | -2.755131 | 350000 | 400000 |
| North West Corner | 53.584207 | -2.907763 | 340000 | 410000 |
| North East Corner | 53.584207 | -2.755131 | 350000 | 410000 |