Based in the North West English Region.
The SD90 10 square kilometre grid intersects with the settlements of Alt Hill,Ashton-under-Lyne,Bottom of Woodhouses,Buckley Wood,Chadderton,Delph,Denshaw,Diggle,Dobcross,Doctor Lane Head,Droylsden,Failsworth,Grains Bar,Grange,Grasscroft,Lees,Linfitts,Luzley,Lydgate,Mossley,New Houses,Oldham,Park Bridge,Quick,Royton,Scouthead,Shaw,Slackcote,Stalybridge,Top o' th' Meadows,Top of Cragg,Top of Lane,Uppermill,Wall Hill,Woodhouse Green & Woodhouses.
SD90 is within the post towns of Ashton-under-lyne, Lancashire, Manchester, Lancashire, Oldham, Lancashire, Rochdale, Lancashire & Stalybridge, Cheshire.
The square is within Oldham District, Rochdale District & Tameside District councils.
The SD90 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 SD90, 457 are land and -357 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 | 53.496621 | -2.152530 | 390000 | 400000 |
| South East Corner | 53.496621 | -2.001466 | 400000 | 400000 |
| North West Corner | 53.586601 | -2.152530 | 390000 | 410000 |
| North East Corner | 53.586601 | -2.001466 | 400000 | 410000 |