A feature of the range is the modest topographic prominence, or drop between many of its peaks. Only two of the eleven Reeks over 3,000 ft meet the Marilyn classification of a mountain (a prominence above 150 metres), namely Carrauntoohil and Cnoc na Péiste. The only Reek that meets the P600 classification (a prominence above 600 metres), is Carrauntoohil itself. The combination of high peaks and low prominence, means the ridges between the peaks are at a sustained height (e.g. why the prominence is so modest), which has contributed to the popularity of ridge walking in the Reeks, particularly, the Coomloughra Horseshoe, and the MacGillycuddy's Reeks Ridge Walk, and the term, Ireland's highest mountain range.