Based in the Eastern English Region & London English Region.
The TL30 10 square kilometre grid intersects with the settlements of Bayford,Brickendon,Cheshunt,Crews Hill,Cuffley,Enfield,Goff's Oak,High Leigh,Hoddesdon,Holyfield,Lower Nazeing,Newgate Street,Waltham Abbey & Waltham Cross.
TL30 is within the post towns of Broxbourne, Hertfordshire, Enfield, Middlesex, Harlow, Essex, Hertford, Hertfordshire, Hoddesdon, Hertfordshire, Potters Bar, Middlesex, Waltham Abbey, Essex, Waltham Cross, Hertfordshire & Ware, Hertfordshire.
The square is within Broxbourne District, East Hertfordshire District, Enfield London Boro, Epping Forest District & Welwyn Hatfield District councils.
The TL30 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 TL30, 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 | 51.681322 | -0.120926 | 530000 | 200000 |
| South East Corner | 51.681322 | 0.027649 | 540000 | 200000 |
| North West Corner | 51.773589 | -0.120926 | 530000 | 210000 |
| North East Corner | 51.773589 | 0.027649 | 540000 | 210000 |