Based in the Eastern English Region & South East English Region.
The SP81 10 square kilometre grid intersects with the settlements of Aston Abbotts,Aston Clinton,Astrope,Aylesbury,Bierton,Bishopstone,Broughton,Buckland,Burcott,Halton,Hardwick,Hulcott,Long Marston,Puttenham,Rowsham,Stoke Mandeville,Weedon,Weston Turville & Wingrave.
SP81 is within the post towns of Aylesbury, Buckinghamshire, Leighton Buzzard, Bedfordshire & Tring, Hertfordshire.
The square is within Buckinghamshire & Dacorum District councils.
The SP81 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 SP81, 523 are land and -423 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 | 51.781444 | -0.841674 | 480000 | 210000 |
| South East Corner | 51.781444 | -0.694150 | 490000 | 210000 |
| North West Corner | 51.872852 | -0.841674 | 480000 | 220000 |
| North East Corner | 51.872852 | -0.694150 | 490000 | 220000 |