A gorge in the high Zagros holds packed snow and ice roughly fifty metres deep — frozen straight through the Iranian summer — while twenty minutes away, on the warm meadow, the Bakhtiari pitch their black goat-hair tents. Winter and high summer in the same valley on the same afternoon — and both the ice and the tents, by every local account, slowly going.
"I rejoiced, as always, in this empty unfurnished landscape, where the imagination had room to move about."
Vita Sackville-West · Twelve Days, crossing the Bakhtiari mountains, 1928
Twenty-five kilometres from Chelgerd, near the village of Sheikh Ali Khan, a deep ravine cuts into the flank of the Zardkuh range, on the northern shoulder of a peak the locals call Ghanbar-Kosh. Down in that shaded cleft, even at the height of July, lies a body of ice. This is Chma (غار یخی چما) — though "cave" flatters it. It is really a gorge that works as a deep-freeze: its depth and orientation keep the sun off the floor, so the snow that pours in each winter never fully leaves.
Year after year that trapped snow compacts, layer over layer, into ice. Local and tourism accounts put the packed depth at up to about fifty metres — there is no precise published survey, so the number is best read as a measure of scale rather than a surveyed fact. Where the ice has hollowed out, it forms blue-white chambers and hanging stalactites; that is where the "cave" comes from. It is not a moving glacier and not a true cave, but a remnant snowfield, a permanent winter held in a crack of the mountain.
Under the ice runs a cold spring, and that is the part that matters beyond the spectacle. Its meltwater drains toward the Koohrang Dam and into the Karun system — the reason this whole district is so often called one of Iran's most important freshwater sources. The wonder you walk up to see is also, quietly, part of the plumbing of a country: snow that fell on a Zagros ridge becomes, eventually, water in a city far downstream.
But "permanent" is a word the ice is starting to outgrow. Local and regional accounts describe the same trend year after year — warmer summers, thinner snowpack, drier winters — leaving the ice noticeably reduced, and in the hot months so thin and unstable in places that walking on it has killed people. There is no long-run scientific survey to put a figure on the retreat, so it is best stated plainly rather than precisely: a body of ice that held for a very long time is, by every local account, no longer holding the way it did. You are looking at a permanent winter in the act of becoming a seasonal one.
You cannot tell the story of Chma without the people whose summer it belongs to. The Bakhtiari are one of Iran's great pastoral peoples — speakers of Bakhtiari, a Luri language — and for as long as anyone can trace, they have moved with the seasons: winter quarters (qeshlaq) in the warm lowlands of Khuzestan, summer pastures (yaylaq) high in the Zagros around Zardkuh. The plain beside the ice cave is one of those summer pastures. The seasonal move itself, the kuch, means crossing the Karun and climbing the snow passes of Zardkuh with the whole community, the flocks, the horses and the pack mules — on foot, on routes worn by generations.
If you have never heard of the Bakhtiari, you may still have seen them. In 1924, two young American filmmakers — Merian C. Cooper and Ernest Schoedsack, who would later make King Kong — and the journalist Marguerite Harrison became the first Westerners to make the migration with a Bakhtiari group. The film they brought back, Grass: A Nation's Battle for Life (1925), shows tens of thousands fording the icy Karun on goatskin floats and climbing barefoot over the snow of Zardkuh. It remains one of cinema's landmark documentaries.
The way of life is far older than the film. Anthropologists trace the Bakhtiari's seasonal pattern to roughly the thirteenth century, taking its present shape over the following centuries; the people themselves, in their own telling, claim descent from Fereydun, the hero of Ferdowsi's Shahnameh who chained the tyrant Zahhak inside Mount Damavand. Outsiders have been recording the migration as a marvel — and an elegy — for a hundred years. The English writer Vita Sackville-West crossed these mountains on muleback in 1927 and wrote them into Twelve Days; half a century after Grass, the Oscar-nominated People of the Wind (1975) filmed the same river-crossing again. Almost every account reaches the same note: that what it is describing is already passing. Sackville-West's editors call her book a portrait of "a vanished world" — and that was written a lifetime ago.
It is worth being honest about what survives of all this. Most Bakhtiari are settled now, in towns and villages, and the full foot migration is a fraction of what it was; many who still move do part of the journey by truck. What you meet on the Chma plain in summer is a living remnant of that older rhythm, not a re-enactment of it — and that is exactly why it is worth meeting with care rather than as a spectacle.
The Bakhtiari are famously hospitable, and an honest, unhurried approach is usually met with tea, bread, and conversation. But they are living their lives, not performing for visitors. Ask before you enter a tent. Ask before you photograph, and above all before photographing women — and accept a no without pressing.
And buy from them. Mountain honey, dried herbs, kashk, fresh butter, a handwoven felt — every purchase goes straight into a pastoral economy that runs on thin margins, and is the simplest way to be a guest worth having.
The black tent, woven from goat hair: naturally rain-shedding, light enough for a mule, cool in summer and warm in winter. A whole household — kitchen, bed, guest room — under one dark roof.
The seasonal migration between Khuzestan and the Zagros: a days-long crossing of rivers and high passes with people and livestock together. Once universal, now much reduced — but not gone.
Bread baked on a saj, fresh doogh, wildflower honey, butter and kashk. A summer diet drawn almost entirely from the flock and the meadow.
Felts (namad), woven bags, jajim and kilims, made by hand through the long summer days. The geometric patterns are tribal markers, passed from mother to daughter.
In summer, the Chma plain smells less like grass than medicine: wild thyme, mountain savory, and pennyroyal crushed underfoot. In spring the lower meadows carry the nodding red of the inverted tulip (Fritillaria, لاله واژگون). Above, on the rock of Zardkuh, are wild goat and ibex; the ravines hold wolf and fox and, more rarely, brown bear, while golden eagles and the great bearded lammergeier work the ridgelines. The cold meltwater streams run clear and trout-bright. It is a generous landscape for the few months the snow allows it.
Untamed Iran rates each place on two axes — Adventure, the demands it makes on your body, and Legacy, the weight it carries in culture and atmosphere. Chma sits in both: a genuinely hazardous mountain ice formation, set inside one of the last living nomadic worlds in Iran.
You are standing on ice, in July, with your breath steaming. Stalactites of ice hang over your head; a thread of meltwater runs clear under your boots, headed for a dam and a city you will never see. You are wearing gloves. Below freezing, where you stand.
Twenty minutes later you are cross-legged on a felt rug inside a siah-chador, drinking doogh poured from a goatskin by a woman with sun-dark hands. The tent smells of goat hair and woodsmoke and baking bread. Outside, a child shouts, a horse stamps, and the meadow is forty degrees and loud with flies and wildflowers. A man passes with a lamb under each arm.
Both of these things — the ice over your head and the tent at your back — have been here far longer than you, and both are quietly leaving. The ice thins with each warm summer; the black tents grow fewer each year, half their journey now made by truck. You came for a frozen marvel and a living one, and what you actually catch is a single valley holding two old, vanishing things in the few weeks they overlap. Stand in it while it is still here.
A winter that held for ages, melting in warmer summers; a way of life that crossed these passes for seven centuries, now riding part of the road by truck. The ice and the black tents are going the same way, in the same valley — and you carry a little of the cold out in your fingers before it does.
On the way to the cave I stopped at Sheikh Ali Khan and climbed a little way up toward the falls, into the July heat. Up there the water throws a fine cool spray off the rocks the whole time, onto my face — a small breeze lifted it and the whole place breathed cool over me. Green plain below; Zardkuh behind it. A hundred metres off, the black tents, a thread of smoke, a child calling somewhere. If I'm ever truly finished, I'll leave all of it and come live in a tent right here.
It was worth a whole pocket of them, that place — but I lit one. The one that tasted of life. I'll never forget it.
The prime window. The ice is still thick and dramatic, the meadows are in full bloom, and the Bakhtiari have arrived with their tents and flocks. The best of both worlds in one short season.
Late summer. Warmer and drier, the nomads often still present — but the ice is at its thinnest and most dangerous, prone to collapse. The window when most accidents happen.
Shoulder months. May can still hold heavy snow at this altitude; October brings cold nights and the nomads may already have gone. For experienced mountain visitors only.
The gorge is sealed by snow and effectively closed. The Bakhtiari are in their winter quarters in Khuzestan, hundreds of kilometres south. Not a visitor season.
⛺ The dark "nomad" months (July–August) are when the Bakhtiari tents are most likely on the plain. If meeting the nomads is part of why you come — and it should be — aim for these. The ice is always there; the tents are seasonal.
The visit itself ends above. What follows is the planning detail — gear, logistics, and questions — folded away so you can open only what you need.
Chma is deep in Iran's most mountainous province and takes some effort to reach. Plan around basing in Chelgerd and choosing the short summer window. Prices move with the rial, so treat any figure as an order of magnitude.
In the Zardkuh range of the western Zagros, Koohrang County, Chaharmahal & Bakhtiari — about 25 km from Chelgerd, near Sheikh Ali Khan village. Drive Shahrekord → Chelgerd → Sheikh Ali Khan; the last stretch is dirt road needing a capable vehicle or a local truck. No public transport reaches the site.
Neither, strictly. It is a deep, shaded gorge that traps winter snow, which compacts into permanent ice — a remnant snowfield rather than a true cave or a moving glacier. Hollowed sections form ice chambers and stalactites, which is where the "cave" name comes from.
Yes — even in July and August. Local and tourism sources put the packed snow and ice at up to about 50 metres, though no precise survey figure is widely published, so read it as scale, not measurement. The ice is thickest in early summer and weakest, most dangerous, in late summer.
Yes — it has killed people. No guardrails, no staff, weak signal that delays rescue. Deaths have come from collapsing ice and falling stalactites, usually after walking on thin ice or going under overhangs. Use a local guide, avoid late-summer ice, and don't stand beneath overhanging ice.
A Luri-speaking pastoral people who historically migrate (the kuch) between Khuzestan and the high Zagros — the Chma plain is a summer pasture. Most are settled now and the migration is much reduced, but families still camp here in summer. They are hospitable, but living their lives: ask before entering or photographing (especially women), and buy from them.
June–July: thick ice, meadows in bloom, and the nomads in camp. Late summer is warmer but the ice is at its most unstable; the cold half of the year the gorge is snowed shut.
Chma rewards being seen as part of two larger stories. One is the high Zagros itself — the alpine world of waterfalls and ridgelines around Chelgerd and Koohrang, and, further south, the cold blue tarn of Gahar Lake, a kindred high-mountain place. The other is the kuch. The Bakhtiari you meet here spend their winters in lowland Khuzestan, and their migration crosses the Karun — the same river whose water, downstream, was tamed centuries ago into the great works of Shushtar. And if it is the living culture that holds you — a people in their own landscape rather than a monument to look at — Chma belongs beside the terraced Kurdish villages of Hawraman and the rock-cut homes of Kandovan: places where the answer to "what is there to see" is, simply, a way of life still being lived.
Untamed Iran prefers official and first-hand sources, and tries to separate what is established from what is popular shorthand. The ice, the setting, the migration, and the dangers draw on the following:
Facts last reviewed June 2026. Established: Chma is a permanent ice-filled gorge in the Zardkuh range near Sheikh Ali Khan, Koohrang County, Chaharmahal & Bakhtiari; the ice persists year-round and its meltwater drains toward the Koohrang Dam / Karun; the area is summer pasture for the Bakhtiari; fatalities from collapsing and falling ice are documented. Popular shorthand, treat with care: the "up to 50 m" depth and the claim that the district is "Iran's largest freshwater source" are widely repeated in tourism writing but not from a precise published survey — given here as scale, not exact fact. Local and regional accounts also report the ice retreating in recent years with warmer summers and lower snowfall; there is no long-run scientific survey to quantify this, so we describe the trend, not a rate. The scale and present extent of the Bakhtiari migration, likewise, are much reduced from the era of Grass. Conditions and access change; confirm ice and road conditions locally before going.