A peak's line parent is the closest higher peak on the highest ridge leading away from the peak's "key col". A col is the lowest point on the ridge between two summits and is synonymous with pass, gap, saddle and notch. A peak's "key col" is the lowest point on the ridge which connects the peak and a higher peak. If there is more than one ridge which can be followed to a higher peak then the line parent is the peak closest to the key col. Usually, a line parent must meet some prominence criteria, which might vary depending on the author and the location of the peak.
- "Line Parent Definition And Database Stability". Bivouac.com. Retrieved 2011-06-05.
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