Based in the Eastern English Region.
The TG21 10 square kilometre grid intersects with the settlements of Belaugh,Coltishall,Crostwick,Frettenham,Great Plumstead,Hainford,Horsham St Faith,Horstead,Newton St Faith,Norwich,Rackheath,Salhouse,Spixworth,Thorpe End,Waterloo & Wroxham.
TG21 is within the post town of Norwich, Norfolk.
The square is within Broadland District, North Norfolk District & Norwich District councils.
The TG21 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 TG21, 269 are land and -169 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 | 52.638988 | 1.250383 | 620000 | 310000 |
| South East Corner | 52.638988 | 1.404895 | 630000 | 310000 |
| North West Corner | 52.732883 | 1.250383 | 620000 | 320000 |
| North East Corner | 52.732883 | 1.404895 | 630000 | 320000 |