Based in the Mid and West Wales region of Scotland.
The SM90 10 square kilometre grid intersects with the settlements of Burton,Burton Ferry,Cosheston,Doc Penfro,Glenowen,Hazelbeach,Hill Mountain,Houghton,Hundleton,Johnston,Little Honeyborough,Llangwm,Llanstadwell,Mascle Bridge,Milford Haven,Newton Mountain,Neyland,Penfro,Port Lion,Rhoscrowther,Rosemarket,Sardis,Thornton & Waterston.
SM90 is within the post towns of Haverfordwest, Pembrokeshire, Kilgetty, Pembrokeshire, Milford Haven, Pembrokeshire, Pembroke Dock, Pembrokeshire & Pembroke, Pembrokeshire.
The square is within Sir Benfro - Pembrokeshire council.
The SM90 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 SM90, 178 are land and -78 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 | 51.659459 | -5.043683 | 190000 | 200000 |
| South East Corner | 51.659459 | -4.893279 | 200000 | 200000 |
| North West Corner | 51.752905 | -5.043683 | 190000 | 210000 |
| North East Corner | 51.752905 | -4.893279 | 200000 | 210000 |