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SN81
Based in the Mid and West Wales region of Scotland & South Wales West region of Scotland.
The SN81 10 square kilometre grid intersects with the settlements of Abercrave,Abercrave / Abercraf,Caehopkin,Coelbren,Dyffryn Cellwen,Glyntawe,Onllwyn,Pen-y-cae,Seven Sisters,Ynyswen & Ystradgynlais.
SN81
SN81 is within the post towns of Aberdare, Glamorgan, Brecon, Brecknockshire, Llangadog, Carmarthenshire, Neath, Glamorgan & Swansea, Glamorgan.
The square is within Castell-nedd Port Talbot - Neath Port Talbot, Powys - Powys & Sir Gaerfyrddin - Carmarthenshire councils.
The SN81 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 SN81, 448 are land and -348 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 | 51.775771 | -3.744202 | 280000 | 210000 |
| South East Corner | 51.775771 | -3.595853 | 290000 | 210000 |
| North West Corner | 51.867703 | -3.744202 | 280000 | 220000 |
| North East Corner | 51.867703 | -3.595853 | 290000 | 220000 |