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TL21
Based in the Eastern English Region.
The TL21 10 square kilometre grid intersects with the settlements of Ayot Green,Birch Green,Bramfield,Bull's Green,Burnham Green,Codicote,Codicote Bottom,Cole Green,Datchworth,Harmer Green,Hatfield,Knebworth,Lemsford,Letty Green,Nup End Green,Oaklands,Pottersheath,Rableyheath,Stanborough,Tewin,Tewin Wood,Watton at Stone,Welwyn,Welwyn Garden City & Woolmer Green.
TL21
TL21 is within the post towns of Hatfield, Hertfordshire, Hertford, Hertfordshire, Hitchin, Hertfordshire, Knebworth, Hertfordshire, St. Albans, Hertfordshire, Welwyn Garden City, Hertfordshire & Welwyn, Hertfordshire.
The square is within East Hertfordshire District, North Hertfordshire District, St. Albans District & Welwyn Hatfield District councils.
The TL21 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 TL21, 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 | 51.773589 | -0.262059 | 520000 | 210000 |
| South East Corner | 51.773589 | -0.113444 | 530000 | 210000 |
| North West Corner | 51.865689 | -0.262059 | 520000 | 220000 |
| North East Corner | 51.865689 | -0.113444 | 530000 | 220000 |