Simm update

Alan Dawson

January 2016

A Simm is a six-hundred metre summit in Britain with a drop of 30 metres all round. The name was changed from Sim to Simm in December 2015. At the end of 2015 there were 2526 Simms, including 767 Marilyns and a further 350 Humps.

Sims were introduced as a hill category in 2010, to incorporate and rationalise an unwieldy assortment of several categories, including Murdos, Corbett Tops (CTs), Graham Tops (GTs), SubGTs, Welsh Hewitts, English Hewitts and Subhewitts. These hill listings were published in a series of five TACit Tables published by TACit Press from 1995 to 2004. This update summarises the changes to these TACit Tables since publication:

TACit Table Year Total then Total at end 2015
The Murdos1995444442
Corbetts Tops and Corbetteers1999668674
Graham Tops and Grahamists2004999994
  600-609.6m in Scotland20047475
The Hewitts and Marilyns of Wales1997137137
  600-609.6m in Wales19971514
The Hewitts and Marilyns of England1997178179
  600-609.6m in England19971413
Total Simms   25272526

Windy Gyle and The Schil are on the Scotland / England border and are counted only once in the overall total.


The following Simms have been discovered since 2004. Height and drop are given to the nearest 0.1m if they are derived from accurate hill surveys.

  Section    Height    Name    Map    Grid ref    Drop 
  01A    648.3    Sron Mhor    51    NN642272    32.4 
  01C    710.5    Stob Glas    50,56    NN365200    30.9 
  01C    661.7    Meall an Lochain    51    NN511237    30.3 
  01C    619.2    Creag na h-Iolaire    51    NN561257    31.7 
  02B    951.4    Beinn nan Eachan East Top    51    NN574383    30.1 
  02B    892.5    Cam-Chreag    51    NN524398    31.3 
  03A    906.2    Aonach Eagach East Top    41    NN155582    33.1 
  06A    756.5    An Sgarsoch Far East Top    43    NN961851    36.0 
  06B    817.6    Carn Bhac South Top    43    NO042809    30.5 
  07A    864.6    Carn Ait    43    NO142734    32.0 
  09A    602.6    Cnapan a'Choire Odhair Mhoir    36    NH904299    36 
  09B    879    Carn Leac East Top    34    NN412978    33 
  09B    875.8    Carn na Criche    35    NH576008    33.1 
  10A    633.4    Beinn Aoidhdailean    33    NG886140    33.3 
  10A    614.1    Sgurr Mor Near West Top    33    NG875079    31.4 
  10B    877    Sgurr a'Choire-bheithe East Top    33    NG900012    31 
  12A  1005.2    Creag Toll a'Choin    25    NH130453  402 
  14A    960.4    Glas Mheall Liath    19    NH077841    32.4 
  17B    829.7    Caisteal a'Garbh-choire    32    NG454202    31.7 

Sgurr Mor Far West Top (10A) was added in 2012 but removed after a survey in 2015.


The following hills listed in TACit Tables have less than 30m drop or are under 600m high and are not Simms.

  Section    Height    Name    Map    Grid ref    Drop 
  01A    598.2    Creag Liath    52    NN913334    29.5 
  01B    753.6    Leacann Amarach    57    NN615164    29.2 
  01C    707.0    Meall Sgallachd    51    NN553259    28.8 
  02B    808.4    Meall Eoghainn    51    NN468323    29.8 
  03A    866.3    Stob Dubh    41    NN151588    28.2 
  03B  1106.9    Stob Coire nam Beith    41    NN138546    28.1 
  03C    995.5    Stob a'Ghlais Choire    41    NN239516    25.8 
  03C    746.8    Creag Dhubh    41    NN258520    28.8 
  06A    753.5    An Sgarsoch East Top (superseded)    43    NN953847    27.9 
  07A    871.9    Crow Craigies South Top    44    NO229790    28.6 
  09B    909.9    Meall a'Bhothain    35    NH663056    29.6 
  12A  1004.9    Maoile Lunndaidh (superseded)    25    NH135458    10.5 
  12B    713    Sgorr na Diollaid Far West Top (point 713m)    25    NH264359    28 
  12B    598.7    Meallan Odhar Doire nan Gillean    25    NH156377  177 
  15A    884    Beinn Dearg North Top    20    NH265819    27 
  15B    688.8    Sidhean a'Choin Bhain    21    NH600803    29.7 
  16B    715.1    Carn an Tionail    10    NC575476    29.6 
  16B    599.7    Meallan Liath    9    NC514503  147.3 
  18A    677.4    Sgurr Dhomhuill Beag    40    NM743756    29.3 
  19C    643.4    Beinn Lochain East Top    56    NN164003    26.2 
  30F    683.7    Gau Graig    124    SH743141    25.4 

Suie Dhu (11A) was demoted in 2013 but reinstated after a survey in 2014.

Summit changes

There have been several summit relocations where the highest point has been changed to a nearby grid reference on the same hill. Selected new heights and grid references are shown below.

  Section    Height    Name    Map    Grid ref    Drop 
  01A    620.3    Meall nam Fiadh (was Creag Odhar)    51    NN691272    67.7 
  01A    618.6    Meall nam Fiadh Far East Top    51,52    NN707272    46.1 
  01B    617.9    Sron na Maoile    57    NN690177    36.5 
  01D    629.9    Beinn Bhreac    50,56    NN202216    92.8 
  02A    736.5    Creag an Loch    52    NN823544    95.7 
  06A    887.0    Elrig 'ic an Toisich    43    NN865788    34.2 
  09B    633.2    Carn Glac an Eich    26,35    NH694267    81.8 
  10B    898    Sgurr nan Eugallt    33    NG927048  612 
  10B    740    Meall a'Choire Dhuibh    33,40    NM917979  101 
  13B    627    Beinn na Feusaige    25    NH090542  226 
  21A    718.4    The Socach    37    NJ279145    87 
  27C    664    Scaw'd Law    78    NS922038    58 
  28B    800.8    Lochcraig Head    79    NT166177  108 
  28B    729.9    Swatte Fell    78    NT118113    36.3 
  30F    676    Maesglase    124,125    SH817150  315 
  32A    802.6    Fan Brycheiniog    160    SN824220  424 
  35B    628.0    Gragareth    98    SD687793    32.8 

The summit of The Saddle was moved to the rock next to the trig pillar in 2013 but moved back to its original correct location following a survey in 2014.

Name changes

Numerous Simms have been renamed since the publication of TACit Tables. Selected changes are shown below.

  Section    Height    Name    Map    Grid ref    Drop 
  01B    708.3    Creag na h-Eararuidh (was Stuc na Cabaig)    57    NN685190  353 
  01C    941.4    Beinn a'Chroin (was Beinn a'Chroin West Top)    50,56    NN387185  137.1 
  01C    940.1    Beinn a'Chroin East Top (was Beinn a'Chroin)    50,56    NN393185    63.1 
  02A    796.5    Creag a'Chaorainn (was Meall Phubuill)    51    NN442438    90.4 
  07A    845.5    Craig Damff (was Cairn Damff)    44    NO247777    33.6 
  09B    648    Leitir Fhionnlaigh (was Druim Ghlaoidh)    34    NN274920  115 
  15A    667    Beinn Bhreac (was Meall Dubh)    20    NH225886  158 
  15A    646    Meall Dubh (was Meall Dubh North Top)    20    NH214900    54 
  17D    702    Trollabhal (was Trallval)    39    NM377952  190 
  30E    607.8    Y Garn (was Glan-hafon)    125    SJ080272    84 
  30E    600.8    Cefn Perfedd (was Moel yr Henfaes East Top)    125    SJ099373    32.3 
  30F    661    Craig-las (was Tyrrau Mawr)    124    SH677135  103 
  31A    684    Drum Peithnant (was Y Garn)    135    SN775851    56 
  35A    609.6    Thack Moor (was Renwick Fell)    86    NY611462    58 

Significant height changes

There have been changes to the height of numerous Simms since the TACit Tables were published. Current details are available in the Database of British and Irish Hills and via the website. Some notable height or drop changes are shown below.

Section Old New Name Map Grid ref Drop  
01B705708.3 Creag na h-Eararuidh57 NN685190353  
01B706706.6 Beinn Dearg57 NN69619773.4
01D870852.4 Stac a'Chuirn50,56 NN19018034.9
02B11181123.0 Meall Garbh51 NN644437198  
02B11181117.0 An Stuc51 NN638431126  
02B916914.3 Creag na Caillich51 NN56237769.3
03C10091024.3 Drochaid Ghlas50 NN08330790.5
05B914914.6 Carn na Caim South Top42 NN66380630.4
07A611609.1 Corwharn44 NO288651152  
08B862863.0 Creag an Dail Bheag36,43 NO157981211  
08B862861.5 Carn Liath36,43 NO16497633.2
10A885885.5 Buidhe Bheinn33 NG963090160  
10A885885.2 Sgurr a'Bhac Chaolais33 NG958110121  
12A915913.4 Sgurr nan Ceannaichean25 NH087480185  
13B762761    A'Chioch24 NG81044638  
14A916914.0 Beinn a'Chlaidheimh19 NH061775268  
17B912914.2 Knight's Peak32 NG47125444  
17B898900.1 Sgurr a'Bhasteir32 NG46425730.1
17C610609.0 Ben Aslak33 NG750191329  
19C658658.3 Stob na Boine Druim-fhinn56 NN168025149.4
21A610609.1 Ladylea Hill37 NJ343168200.9
27B786786.8 Kirriereoch Hill77 NX420869150.2
30B9991000.8 Glyder Fawr115 SH642579642  
30B609609.8 Mynydd Graig Goch115,123 SH49748571  
35A609609.6 Thack Moor86 NY61146258  
35B609610.4 Birks Fell98 SD918763158  

Most prominent Simms

These are the Simms with the greatest relative height.

Section Height Name Map Grid ref Drop 
04A  1344    Ben Nevis  41   NN166712  1344  
11A  1182.8 Carn Eige  25   NH123261  1146  
30B  1084.7 Snowdon  115   SH609543  1039  
17B  992   Sgurr Alasdair  32   NG450207  992  
01C  1174   Ben More  51   NN432244  985  
17E  966   Ben More (Mull)  47,48   NM525330  966  
13A  1055   Spidean a'Choire Leith, Liathach  25   NG929579  957  
08A  1309   Ben Macdui  36,43   NN989989  950  
14B  1110   Sgurr Mor  20   NH203718  915  
02B  1214   Ben Lawers  51   NN635414  915  
34B  978   Scafell Pike  89,90   NY215072  912  
03C  1127.0 Ben Cruachan  50   NN069304  880  

Lowest Simms

These Simms are less than 601m high.

Section Height Name Map Grid ref Drop  
17E 600.8 Cruachan Beag47,48 NM578338 34.4
27C 600.5 Hare Hill71,77 NS654097 74  
30B 600.1 Foel Lwyd115 SH720723 51 
30E 600.8 Cefn Perfedd125 SJ099373 32.3
30E 600.4 Y Gribin124,125 SH843177 34.1
32C 600  Craig y Llyn170 SN906031392 
34D 600  Black Combe96 SD135854362 


A Subsimm is a hill at least 600m high with a drop all round of 20-29.9m. There are currently around 660 Subsimms. Over 150 of these have been surveyed to show that they have less than 30m drop. There are 28 unsurveyed hills with a drop of 29m and 30 with a drop of 30m, so there will undoubtedly be further changes to the Simms and Subsimms in future.

Simm Hall of Fame

Membership of the Simm Hall of Fame is open to anyone who has climbed over 2000 Simms. By December 2015 there were just seven members. A further 17 people have reported climbing over 1500 Simms and have therefore entered the Corridor that leads to the Simm Hall of Fame. Anyone eligible to join the Hall or Corridor should contact the author via email to


Thanks are due to Myrddyn Phillips for surveys of several Simms that have confirmed their status and produced accurate height and drop data, and to GJ Surveys (John Barnard, Graham Jackson and Myrddyn Phillips) for their survey of Gau Graig. (All other surveys leading to changes in Simm status have been carried out by Alan Dawson.) Thanks also to Jim Bloomer, Chris Crocker and Mark Jackson, who have helped to discover potential new Simms or new summits for existing Simms by studying OS maps.