Based in the North West English Region.
The SD61 10 square kilometre grid intersects with the settlements of Adlington,Belmont,Blackrod,Bolton,Bottom o' th' Moor,Chorley,Grimeford Village,Horwich,Limbrick,Little Scotland,Montcliffe,Rivington,Wallsuches & White Coppice.
SD61 is within the post towns of Bolton, Lancashire, Chorley, Lancashire, Darwen, Lancashire & Wigan, Lancashire.
The square is within Blackburn with Darwen, Bolton District, Chorley District & Wigan District councils.
The SD61 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 SD61, 432 are land and -332 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 | 53.585066 | -2.606977 | 360000 | 410000 |
| South East Corner | 53.585066 | -2.454640 | 370000 | 410000 |
| North West Corner | 53.675616 | -2.606977 | 360000 | 420000 |
| North East Corner | 53.675616 | -2.454640 | 370000 | 420000 |