The Purple Mountain Group is described as a "heather–strewn"
massif with five classified peaks at its centre: Purple Mountain ,
Purple Mountain NE Top and
Shehy Mountain ,
Tomies Mountain (also called
An Chathair) , and
Tomies North Top (also called
Tomies Rock, or
Tomies Chimneys after its gullies that lead to its summit) . Purple Mountain's individual prominence qualifies it as a
Marilyn, and its prominence is within 10 metres of the
P600 prominence threshold of , which classes Purple Mountain as a "Sub–major" mountain. Purple Mountain meets the
Arderin,
Simm and
Hewitt classifications. == Name==