Based in the Mid Scotland and Fife region of Scotland.
The NN90 10 square kilometre grid intersects with the settlements of Blackford,Glendevon & Pool of Muckhart.
NN90 is within the post towns of Auchterarder, Perthshire, Dollar, Clackmannanshire & Perth, Perthshire.
The square is within Clackmannanshire & Perth and Kinross councils.
The NN90 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 NN90, 522 are land and -422 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 | 56.179887 | -3.777761 | 290000 | 700000 |
| South East Corner | 56.179887 | -3.612590 | 300000 | 700000 |
| North West Corner | 56.271900 | -3.777761 | 290000 | 710000 |
| North East Corner | 56.271900 | -3.612590 | 300000 | 710000 |