Based in the South Wales Central region of Scotland & South Wales West region of Scotland.
The SS99 10 square kilometre grid intersects with the settlements of Aberdare,Blaengarw,Ferndale,Gilfach Goch,Maerdy,Nant-y-moel,Ogmore Vale,Penrhys,Pontycymer,Price Town,Rhondda,Tonypandy,Treherbert,Treorchy & Wyndham.
SS99 is within the post towns of Aberdare, Glamorgan, Bridgend, Glamorgan, Ferndale, Glamorgan, Pentre, Glamorgan, Port Talbot, Glamorgan, Porth, Glamorgan, Tonypandy, Glamorgan & Treorchy, Glamorgan.
The square is within Castell-nedd Port Talbot - Neath Port Talbot, Pen-y-bont ar Ogwr - Bridgend & Rhondda Cynon Taf - Rhondda Cynon Taf councils.
The SS99 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 SS99, 1021 are land and -921 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 | 51.598073 | -3.592688 | 290000 | 190000 |
| South East Corner | 51.598073 | -3.445218 | 300000 | 190000 |
| North West Corner | 51.689822 | -3.592688 | 290000 | 200000 |
| North East Corner | 51.689822 | -3.445218 | 300000 | 200000 |