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SD21
Based in the North West English Region.
The SD21 10 square kilometre grid intersects with the settlement of Southport.
SD21
SD21 is within the post towns of Liverpool, Lancashire & Southport, Lancashire.
The square is within Sefton District council.
The SD21 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 SD21, 319 are land and -219 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 | 53.580482 | -3.212369 | 320000 | 410000 |
| South East Corner | 53.580482 | -3.058785 | 330000 | 410000 |
| North West Corner | 53.671780 | -3.212369 | 320000 | 420000 |
| North East Corner | 53.671780 | -3.058785 | 330000 | 420000 |