Where mountains are ranked by height, the definition of the topographical prominence used to classify the mountain , is noted.
In British definitions, a height of 600 metres is required for a mountain, whereas in Ireland, a lower threshold of 500 metres is sometimes advocated.
The lowest minimum prominence threshold of any definition of an Irish mountain is 15 metres , however most definitions, including the International Climbing and Mountaineering Federation criteria, do not consider prominences below 30 metres as being mountains .
Many British definitions consider a peak with a prominence below 150 metres , as being a top, and not a mountain .
A widely used definition of an Irish mountain requires a minimum prominence of 100 metres , and is the basis for the 100 Highest Irish Mountains.
While Irish mountains are ranked according to Irish classifications, they are also ranked on classifications that cover Britain and Ireland .Read more