The mountains rise from the central plain of Ireland to a height of 527 metres. While not very high, they are extensive by local standards. The highest points are Arderin (527 m) at the southwestern end of the range and Baunreaghcong (511 m) at the end of the Ridge of Capard.
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The mountains are in the centre of Ireland, [...]. The Slieve Bloom, along with the Massif Central in France, are the oldest mountains in Europe; they were once also the highest at 3,700m. Weathering has reduced them to 527m. On a clear day, one can see the high points of the four ancient provinces of Ireland.
Tarbarrels and bonfires were lighted along the coastline of the four seas on the summits of the Hill of Howth, Three Rock Mountain, Sugarloaf, Bray Head, the mountains of Mourne, the Galtees, the Ox and Donegal and Sperrin peaks, the Nagles and the Bograghs, the Connemara hills, the reeks of M’Gillicuddy, Slieve Aughty, Slieve Bernagh and Slieve Bloom.