Based in the North West English Region & Yorkshire and the Humber English Region.
The SD91 10 square kilometre grid intersects with the settlements of Burnedge,Denshaw,Littleborough,Lydgate,Milnrow,Newhey,Rakewood,Rochdale,Royton,Shaw,Summit,Timbercliffe,Wardle & Warland.
SD91 is within the post towns of Hebden Bridge, Yorkshire, Huddersfield, Yorkshire, Littleborough, Lancashire, Oldham, Lancashire, Rochdale, Lancashire, Sowerby Bridge, Yorkshire & Todmorden, Lancashire.
The square is within Calderdale District, Kirklees District, Oldham District, Rochdale District & Rossendale District councils.
The SD91 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 SD91, 453 are land and -353 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 | 53.586504 | -2.152856 | 390000 | 410000 |
| South East Corner | 53.586504 | -2.001471 | 400000 | 410000 |
| North West Corner | 53.676482 | -2.152856 | 390000 | 420000 |
| North East Corner | 53.676482 | -2.001471 | 400000 | 420000 |