Based in the Mid and West Wales region of Scotland & West Midlands English Region.
The SO18 10 square kilometre grid intersects with the settlements of Kerry,Kerry / Ceri & Y Drenewydd.
SO18 is within the post towns of Knighton, Radnorshire, Llandrindod Wells, Radnorshire, Lydbury North, Shropshire & Newtown, Montgomeryshire.
The square is within Powys - Powys & Shropshire councils.
The SO18 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 SO18, 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 | 52.410586 | -3.327247 | 310000 | 280000 |
| South East Corner | 52.410586 | -3.177568 | 320000 | 280000 |
| North West Corner | 52.502023 | -3.327247 | 310000 | 290000 |
| North East Corner | 52.502023 | -3.177568 | 320000 | 290000 |