
Inside an old volcano.
About 60 million years ago this was a volcano ten kilometres wide. Since then more than two kilometres of rock have worn away, and the magma chamber that fed it is what you are standing on.

Skye's serious mountains: the eroded heart of a volcano some 60 million years old, with Sgùrr Alasdair at 992 metres.
The Cuillin fill the south of Skye: the Black Cuillin, dark and jagged, and the rounder, granite Red Cuillin to the east.
Visited and photographed by Simon Hird
Both date from the volcanic activity of about 60 million years ago, and the Black Cuillin are the exposed roots of the volcano itself, with more than two kilometres of rock worn away since. Their ridge carries eleven Munros joined by miles of knife-edge scrambling, and Sgùrr Alasdair, at 992 metres, is the highest mountain in Britain off the mainland.
These are serious mountains. The ridge, and the Inaccessible Pinnacle with its rock climb and abseil, are for experienced climbers; if you are inexperienced or unsure, hire a guide. You can still come close: Coire Lagan, a rough walk from Glen Brittle with some scrambling near the corrie, goes in among the peaks, and in the boating season boats run from Elgol to Loch Coruisk. On any hill here, carry a map and compass, waterproofs and warm spare clothing, check the forecast and tell someone your plan.
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The Cuillin is serious mountain country: steep, rocky and high.
The main ridge and the Inaccessible Pinnacle need climbing experience, or a guide. Everything below is for planning, not for deciding whether a day is safe.
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About 60 million years ago this was a volcano ten kilometres wide. Since then more than two kilometres of rock have worn away, and the magma chamber that fed it is what you are standing on.

The Black Cuillin are gabbro, a dark, coarse rock that cooled slowly underground. As the magma changed and grew richer in silica, it cooled as granite instead, and granite makes up the Red Cuillin to the east.

Sgùrr Alasdair, at 992 metres, is the highest mountain in Britain off the mainland, and it has perhaps the smallest summit in the Cuillin.

The Inaccessible Pinnacle, 986 metres, rises from the top of Sgùrr Dearg. It is the most difficult of all the Munros: reaching the top takes a rock climb, and coming down an abseil.

The Cuillin Ridge was thought to need days. On 10 June 1911 Leslie Shadbolt and Alastair McLaren crossed it in one, 12 hours and 18 minutes from the first summit to the last. Nobody repeated it until 1920.

In the last ice age glaciers flowed out from the heart of the Cuillin. The long parallel grooves they cut in the rock still show which way the ice was moving.
This iconic, razor-backed range – generally divided between the round-topped Red Cuillin and the more jagged Black Cuillin – contains no less than 12 Munros. Serious climbers and mountaineers are drawn here in numbers. The rewards are superb, but you should be aware that many routes are very challenging. Mountain guides and climbing instructors can both be hired if needed.
Read moreThe jagged peaks of the Cuillin mountains on Skye dominate much of the island's incredible scenery. Looking at them is one thing, but hiking them is another matter entirely. Even though many locals would have no doubt climbed these peaks over the centuries, by the 19th century th
Read the storyLegend says that the Black Cuillin mountains were formed after the Sun threw an enormous spear into the island, causing the ground to bubble up and burst into jagged peaks.
Read moreThe only one of Scotland’s Munros that requires technical rock climbing is the Inaccessible Pinnacle – otherwise known as the In Pin on Sgurr Dearg, part of the Black Cuillins.
Read more
New places, news and stories, as we find them.
What is on on SkyeIn the south of Skye, between Glen Brittle on the west, Sligachan on the north and Elgol and Loch Coruisk on the south.
Glen Brittle BeachA sandy beach at the head of Loch Brittle, under the Cuillin, with a campsite and café behind it.Under a mile 1 min by road
Fairy PoolsClear pools and falls on the Allt Coire a' Mhadaidh where it comes down Coire na Creiche into Glen Brittle, under the north side of the Black Cuillin.3 miles 4 min by road
Café CùilA red-roofed café on the shore of Loch Harport by Carbost, serving Hebridean brunch from a Skye chef who began in Hackney.8 miles 10 min by road
SligachanThe Sligachan Hotel and the old stone bridge below the Cuillin, where the A87 meets the road to Dunvegan.14 miles 18 min by road
Sligachan Old BridgeA humped stone bridge of about 1810 to 1818 by Thomas Telford, with the Cuillin rising behind it.14 miles 17 min by road
Glen SligachanThe long glen running south from Sligachan with the Black Cuillin on one side and the Red on the other, and no road down it at all.14 miles 19 min by roadPlaces to stay near the Cuillin, and when each is next free.
Glenbrittle Campsite
Sligachan Blackhouses
Sligachan Campsite
Coruisk HouseWe want to show you the best that Scotland has to offer. The makers and the creatives, the enduring experiences, the evocative tales, the concealed corners. The roads less travelled that take you to places that matter. The adventures that gather you up and sweep you away. The blend of the wild and the artistic that makes Scotland what it is. We’d love for you to join us.
What we have written about it and more on Skye.
For further reading, before you go. The details on this page were checked on .