Based in the North West English Region.
The SD81 10 square kilometre grid intersects with the settlements of Broadley Fold,Bury,Catley Lane Head,Crimble,Edenfield,Heywood,Nangreaves,Nar,Old Birtle,Rain Shore,Ramsbottom,Red Lumb,Rochdale,Shuttleworth,Turn,Whitworth & Wolstenholme.
SD81 is within the post towns of Bacup, Lancashire, Bury, Lancashire, Heywood, Lancashire, Manchester, Lancashire, Rochdale, Lancashire & Rossendale, Lancashire.
The square is within Bury District, Rochdale District & Rossendale District councils.
The SD81 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 SD81, 444 are land and -344 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 | 53.586215 | -2.304234 | 380000 | 410000 |
| South East Corner | 53.586215 | -2.152530 | 390000 | 410000 |
| North West Corner | 53.676385 | -2.304234 | 380000 | 420000 |
| North East Corner | 53.676385 | -2.152530 | 390000 | 420000 |