List of P600 mountains in the British Isles

British Isles mountain cartographer, Alan Dawson, developer of the Marilyns designation, labelled "Majors" as having a prominence of over , but no other criteria. Dawson's prominence threshold was the normal height threshold for a British Isles mountain, and 111 mountains met his definition. The current list has 120 mountains, although there is dispute as to whether Moel Siabod's prominence is above 600 metres (2,000 ft), or is in fact just below the threshold at 599.9 metres. These tables are therefore subject to being revised over time, and should not be amended or updated unless the entire DoBIH data is re-downloaded again. (‡) Would not have been eligible for Dawson's 2004 "imperial" list of 111 mountains with prominence over . (‡‡) Added since the 2006 "metric" list of 119 mountains with prominence over , based on updated surveys. ==Sub–Majors by height==

In 2006, mountain database publisher, Mark Trengove, added a list of seven "Sub–Majors" (to Dawson, Woodall, and de Ferranti's P600 "Majors"), which had a prominence of between , and which possibly could become P600s, or Majors, in the future due to any possible discovered "contour uncertainty, rounding error, or map error". Since 2006, one of Trengrove's Sub–Majors, Moel Siabod, was re–surveyed and shown to be a P600 "Major". The list below is the October 2018 DoBIH list of the six mountains with a prominence between in the British Isles. ==DoBIH codes==

The DoBIH uses the following codes for the various classifications of mountains and hills in the British Isles, which many of the above peaks also fall into: Prefixes • s sub • x deleted Suffixes • = twin ==See also==