List of P600 mountains in the British Isles

P600s (the "Majors")
Moel Siabod in Snowdonia, North Wales, the newest addition to the list of P600s.
Highest point
Elevation	no requirement; but by definition, elevation is over 600 m (1,969 ft))
Prominence	over 600 m (1,969 ft)
Geography
Location	120 British Isles: 81 Scotland 26 Ireland 8 Wales 4 England 1 Isle of Man

This is a list of P600 mountains in the British Isles by height. A P600 is defined as a mountain with a topographic prominence above 600 metres (1,969 ft), regardless of elevation or any other merits (e.g. topographic isolation); this is a similar approach to that of the Marilyn, HuMP and TuMP British Isle mountain and hill classifications. P600 is also an international UIAA classification criterion, along with the P1500 Ultras, which defines a "major mountain".^[1][2] The terms P600 and "Majors" are used interchangeably.^[3][4][5]

As of October 2018, there were 120 P600s in the British Isles: 81 in Scotland, 25 in Ireland, 8 in Wales, 1 in Northern Ireland, and 1 in the Isle of Man. The list of British Isles P600s contains 54 of the 282 Scottish Munros, and 10 of the 34 Non-Scottish Munros (or Furths), all of which have prominences above 3,000 feet (914.4 m), and are sometimes called the "Super-Majors". The list also contains the highest mountains in Scotland, Wales, Ireland, and England.

P600 mountains by height

British Isles mountain cartographer, Alan Dawson, developer of the Marilyns designation,^{[lower-alpha 1][6]} labelled "Majors" as having a prominence of over 2,000 ft (610 m), but no other criteria. Dawson's prominence threshold was the normal height threshold for a British Isles mountain,^[7] and 111 mountains met his definition.^[7] In 2004, Dawson's prominence was converted into a metric threshold of 600 metres (1,969 ft) by Rob Woodall & Jonathan de Ferranti, and labelled the "P600s", a term used by the UIAA for major mountains; the P600s expanded to 119 mountains.^[7][8] The current list has 120 mountains.

This list below was downloaded from the Database of British and Irish Hills ("DoBIH")^{[lower-alpha 2]} in October 2018. Note that topological prominence, unlike topological elevation, is far more complex to measure and requires a survey of the entire contours of a peak, rather than a single point of height.^[11] 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 2,000 ft (610 m).
(‡‡) Added since the 2006 "metric" list of 119 mountains with prominence over 2,000 ft (610 m), 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 590–600 m (1,940–1,970 ft), and which possibly could become P600s, or Majors, in the future due to any possible discovered "contour uncertainty, rounding error, or map error".^[7][8] 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^{[lower-alpha 2]} list of the six mountains with a prominence between 590–600 m (1,940–1,970 ft) 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:^[12]

Ma Marilyn
Hu Hump
Sim Simm
5 Dodd
M Munro
MT Munro Top
F Furth
C Corbett
G Graham
D Donald
DT Donald Top
Hew Hewitt
N Nuttall
Dew Dewey
DDew Donald Dewey
HF Highland Five
4 400-499m Tump
3 300-399m Tump (GB)
2 200-299m Tump (GB)
1 100-199m Tump (GB)
0 0-99m Tump (GB)
W Wainwright
WO Wainwright Outlying Fell
B Birkett
Sy Synge
Fel Fellranger
CoH County Top – Historic (pre-1974)
CoA County Top – Administrative (1974 to mid-1990s)
CoU County Top – Current County or Unitary Authority
CoL County Top – Current London Borough
SIB Significant Island of Britain
Dil Dillon
A Arderin
VL Vandeleur-Lynam
MDew Myrddyn Dewey
O Other list
Un unclassified

prefixes:
s sub
x deleted

suffixes:
= twin

See also

• List of mountains of the British Isles by height
• List of mountains of the British Isles by prominence
• Lists of mountains and hills in the British Isles
• List of mountains in Ireland
• List of Munro mountains in Scotland
• List of Murdo mountains in Scotland
• List of Furth mountains in the British Isles
• List of Marilyns in the British Isles

Notes

References

1. Dawson, Alan (1992). The Relative Hills of Britain. Milnthorpe, Cumbria: Cicerone Press. ISBN 1-85284-068-4. Archived from the original on 2010-09-21.
2. Clements, E.D. 'Clem' (1998). The Hewitts and Marilyns of Ireland. Cambuskenneth, Stirling: TACit Press. ISBN 0-9522680-8-6.
3. Maizlish, Aaron; Dawson, Alan; Woodall, Rob; Trengove, Mark. "Great Britain P600m summits". Retrieved 2006-08-10.

External links

• The Database of British and Irish Hills (DoBIH), the largest database of British Isles mountains
• Hill Bagging UK & Ireland, the searchable interface for the DoBIH
• Alan Dawson, Rob Woodall & Jonathan de Ferranti P600 (the "Majors") Table
• The P600s: The 119 Major Mountains of Britain and Ireland
• The 119 The P600m Peaks in the British Isles