Based in the Eastern English Region.
The TL81 10 square kilometre grid intersects with the settlements of Beacon Hill,Feering,Great Braxted,Great Totham,Hatfield Peverel,Inworth,Kelvedon,Little Totham,Messing,Nounsley,Rivenhall,Rivenhall End,Silver End,Tiptree,Tiptree Heath,Tolleshunt Major,Totham Hill,Wickham Bishops,Windmill Hill & Witham.
TL81 is within the post towns of Braintree, Essex, Chelmsford, Essex, Colchester, Essex, Maldon, Essex & Witham, Essex.
The square is within Braintree District, Colchester District & Maldon District councils.
The TL81 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 TL81, 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 | 51.756461 | 0.606795 | 580000 | 210000 |
| South East Corner | 51.756461 | 0.756994 | 590000 | 210000 |
| North West Corner | 51.849580 | 0.606795 | 580000 | 220000 |
| North East Corner | 51.849580 | 0.756994 | 590000 | 220000 |