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Ireland's 20km Isolation High Points

Each of Ireland's 20km Isolation High Points represents the highest place in all directions within a 20km radius This original list, researched and compiled by Kieron Gribbon, is one of the eight primary sub-lists used to create the Ireland's Major Geographical High Points list which was first published on 5th December 2015 on our High Point Ireland website.

Click here if you would like to earn a Certificate of Completion for the year-long challenge associated with this list.

High Points offer great walking opportunities all year round, however we particularly recommend visiting them during months when the days are longest. For this reason, we promote upland walking as our monthly theme for June.

#JuneUplandWalk

All-Ireland map
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​Each marker on the map represents the location of a 20km Isolation High Point in Ireland. Click on a marker for further information about that location. All the summit locations marked on this map have also been listed in height order below.

Listed by height
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High Point name Elevation Irish Grid Reference Upland area
Carrauntoohil 1,039m V:804:844 MacGillycuddy's Reeks
Brandon Mountain 952m Q:460:116 Dingle Mountains
Lugnaquillia Mountain 925m T:032:918 Wicklow Mountains
Galtymore Mountain 918m R:878:238 Galtee Mountains
Baurtregaum 851m Q:750:077 Slieve Mish Mountains
Slieve Donard 850m J:358:277 Mourne Mountains
Mweelrea 814m L:790:668 Mweelrea Mountains
Nephin 806m G:103:080 Standalone mountain summit
Mount Leinster 794m S:827:525 Blackstairs Mountains
Knockmealdown 793m S:058:084 Knockmealdown Mountains
Kilclooney Mountain 792m S:317:105 Comeragh Mountains
Errigal Mountain 751m B:928:208 Derryveagh Mountains
Keeper Hill 694m R:824:667 Silvermine Mountains
Croaghaun 688m F:560:061 West Achill Hills
Hungry Hill 685m V:761:498 Caha Mountains Southwest
Sawel Mountain 678m H:618:973 Sperrin Mountains
Croaghgorm 674m G:948:896 Bluestack Mountains
Cuilcagh 665m H:124:280 Cuilcagh Hills
Truskmore 647m G:759:473 Dartry Mountains Northwest
Slieve Snaght 615m C:424:390 Central Inishowen Hills
Slieve League 595m G:544:784 Southwest Donegal Hills
Trostan 550m D:180:236 Antrim Hills
Knockalongy 544m G:504:275 Ox Mountains
Arderin 527m S:232:989 Slieve Bloom Mountains
Devilsbit Mountain 480m S:058:744 Devilsbit Hills
Divis 478m J:281:755 Belfast Hills
Agnew's Hill 474m D:328:017 Antrim Hills
Baraveha 451m R:112:086 Mullaghareirk Mountains
Knocknaskagh 427m W:703:950 Nagles Mountains
Slievecallan 391m R:144:773 Southwest Clare Hills
Slieve Beagh 380m H:524:436 Slieve Beagh Hills
Maumakeogh 379m G:037:368 Maumakeogh Hills
Clomantagh Hill 349m S:333:655 Slieveardagh Hills North
Slieve Elva 344m M:150:044 The Burren Hills
Loughanleagh 339m N:722:959 North Midland Hills
Clogrennan Hill 336m S:669:741 Slievemargy Hills
Slieve Glah 320m H:462:008 North Midland Hills
Knockfeerina 288m R:451:361 Standalone summit
Corn Hill 278m N:188:842 Standalone summit
Slieve na Calliagh 276m N:586:776 North Midland Hills
Slieve Bawn 262m M:954:744 Standalone summit
Mount Oriel 251m N:982:833 Mount Oriel Hills
Forth Mountain 237m S:981:192 Standalone summit
Croghan Hill 234m N:481:331 Standalone summit
Dunmurry Hill 233m N:714:169 Standalone summit
Knockastia 200m N:246:434 Standalone summit
Knockroe 168m M:507:413 Standalone summit
Inishmore 123m L:861:097 Island summit

Ireland's 20km Isolation High Points

  • Carrauntoohil (1,039m)
  • Brandon Mountain (952m)
  • Lugnaquillia Mountain (925m)
  • Galtymore Mountain (918m)
  • Baurtregaum (851m)
  • Slieve Donard (850m)
  • Mweelrea (814m)
  • Nephin (806m)
  • Mount Leinster (794m)
  • Knockmealdown (793m)
  • Kilclooney Mountain (792m)
  • Errigal Mountain (751m)
  • Keeper Hill (694m)
  • Croaghaun (688m)
  • Hungry Hill (685m)
  • Sawel Mountain (678m)
  • Croaghgorm (674m)
  • Cuilcagh (665m)
  • Truskmore (647m)
  • Slieve Snaght (615m)
  • Slieve League (595m)
  • Trostan (550m)
  • Knockalongy (544m)
  • Arderin (527m)
  • Devilsbit Mountain (480m)
  • Divis (478m)
  • Agnew's Hill (474m)
  • Baraveha (451m)
  • Knocknaskagh (427m)
  • Slievecallan (391m)
  • Slieve Beagh (380m)
  • Maumakeogh (379m)
  • Clomantagh Hill (349m)
  • Slieve Elva (344m)
  • Loughanleagh (339m)
  • Clogrennan Hill (336m)
  • Slieve Glah (320m)
  • Knockfeerina (288m)
  • Corn Hill (278m)
  • Slieve na Calliagh (276m)
  • Slieve Bawn (262m)
  • Mount Oriel (251m)
  • Forth Mountain (237m)
  • Croghan Hill (234m)
  • Dunmurry Hill (233m)
  • Knockastia (200m)
  • Knockroe (168m)
  • Inishmore (123m)

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