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Croghan when translated means a round or piled up hill.
It is 769 feet above sea level and 460 above the land.
Millions of years ago it was a volcano which it is estimated erupted 325 million years ago.
This was at the end of the carboniferous period and Ireland at that time looked like a vast coastal swamp.
Standing on the top of the hill you can see all of Offaly and its boundaries.
The Slieve Blooms, the Hills of Laois, the Hill of Allen, The Wicklow Mountains and on a clear day the Mountains of Mourne can be seen.
This is why the hill was used as a main point when the Ordnance Survey maps of Ireland were made.