Based in the Eastern English Region.
The TM23 10 square kilometre grid intersects with the settlements of Chelmondiston,Church End,Erwarton,Falkenham,Felixstowe,Harwich,Kirton,Levington,Nacton,Parkeston,Ramsey,Shotley,Shotley Common,Shotley Gate,Trimley St Martin & Trimley St Mary.
TM23 is within the post towns of Felixstowe, Suffolk, Harwich, Essex & Ipswich, Suffolk.
The square is within Babergh District, East Suffolk District & Tendring District councils.
The TM23 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 TM23, 252 are land and -152 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 | 51.921000 | 1.198219 | 620000 | 230000 |
| South East Corner | 51.921000 | 1.350085 | 630000 | 230000 |
| North West Corner | 52.014805 | 1.198219 | 620000 | 240000 |
| North East Corner | 52.014805 | 1.350085 | 630000 | 240000 |