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K2 from Broad Peak Base Camp

Natural wonder Asia

K2

K2 is the second tallest mountain in the world. It is a giant pointy peak of rock, snow and ice in Asia. Rivers of ice flow around its feet.

K2 is the world's second highest mountain, 8,611 meters tall, in the Karakoram Range of Asia. It got its short name in 1856, when a surveyor marked it as the second peak he measured in the Karakoram. It is one of the hardest mountains to climb, and its summit was first reached in 1954.

K2 (8,611 m) is the second highest summit on Earth after Mount Everest, a glacier-clad pyramid in the Karakoram Range rising from about 4,570 m on the Godwin Austen Glacier, a tributary of the Baltoro. Britannica places it partly in a Chinese-administered part of the Kashmir region within Xinjiang and partly in Pakistan-administered Gilgit-Baltistan. First climbed in 1954 by an Italian expedition, it received its first winter ascent from a team of ten Nepali climbers in January 2021.

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Photo: Zacharie Grossen, CC BY-SA 4.0, via Wikimedia Commons

Discover K2

K2 is a huge mountain in Asia.

Only one mountain in the world is taller. K2 is shaped like a giant pointy tent. Snow and ice cover its sides. Rivers of ice called glaciers flow around its feet.

K2 is the second highest mountain on Earth. Only Mount Everest is taller. K2 reaches 8,611 meters above sea level, and it stands in the Karakoram, a range of very high mountains in Asia, on the boundary between land run by Pakistan and land run by China.

The mountain rises like a giant pyramid of rock, snow and ice. Its base sits at about 4,570 meters on the Godwin Austen Glacier, a river of ice that flows into the much bigger Baltoro Glacier. K2 has other names too, such as Chogori and Mount Godwin Austen.

Britannica gives K2 a height of 8,611 m (28,251 ft), second only to Mount Everest, and places it in the Karakoram Range, partly in a Chinese-administered enclave of the Kashmir region within the Xinjiang Uygur Autonomous Region and partly in the Gilgit-Baltistan portion of Kashmir administered by Pakistan. Because the Kashmir region is disputed, each side of the mountain is described here by who administers it.

The snow- and glacier-covered summit rises from about 4,570 m on the Godwin Austen Glacier, a tributary of the Baltoro Glacier. The Karakoram, Britannica says, holds the greatest concentration of high mountains in the world: its peaks average about 6,100 m, and four exceed 7,900 m. Four of the fourteen peaks above 8,000 m, K2, Gasherbrum I, Gasherbrum II and Broad Peak, lie in Gilgit-Baltistan, according to its Forest, Wildlife and Environment Department.

Height
8,611 m
Range
Karakoram
Rises from
about 4,570 m, on the Godwin Austen Glacier
Named
1856, the second peak measured in the Karakoram
First ascent
31 July 1954
K2 from Broad Peak Base Camp
Photo: Zacharie Grossen, CC BY-SA 4.0, via Wikimedia Commons

Hard rock, lifted and carved by ice

K2 is made of very hard rock.

Over millions of years, the rock was squeezed and pushed up high. Then snow piled up and turned into ice. Rivers of ice grind the rock as they slide.

The Karakoram mountains were squeezed and folded within the last 65 million years, Britannica explains. Their heart is made of very hard rocks such as granite and gneiss. The land here is still restless: earthquakes happen often, and hot springs bubble up in some valleys.

Because the peaks are so high, everything that falls from the sky above about 4,900 meters falls as snow, and the snow packs down into ice. That ice forms some of the longest glaciers found outside the polar regions. The Baltoro Glacier, which flows past K2, moves about 2 meters a day. As they slide, glaciers grind rock into a fine powder called rock flour, which turns the meltwater cloudy.

Britannica attributes the Karakoram to folding in the Cenozoic Era (the past 65 million years), followed by intense, geologically recent uplift. Granites, gneisses, crystalline schists and phyllites form its central core, edged to the north and south by Paleozoic and partly Mesozoic limestones and micaceous slates. Seismic activity remains frequent, sometimes violent enough to set off massive rock and ice avalanches, and hot springs occur in several areas.

Glaciation is heavy, especially on the moister southern slopes, where the snow line lies at about 4,700 m and glaciers descend to about 2,900 m; on the drier northern slopes the figures are about 5,900 m and 3,500 m. Above about 4,900 m precipitation always falls as snow. Britannica describes the Karakoram's glaciers as the longest outside the high latitudes, often merging into systems that fill whole watersheds, and notes that the Baltoro Glacier moves about 2 m a day. Rock flour ground by the ice makes the meltwater opaque and gives the Indus its heavy sediment load.

Life below the ice

High on K2 there is only rock, snow and ice.

Lower down, wild goats and sheep climb the steep slopes. Snow leopards live in these mountains too. Big birds glide on the mountain winds.

Nothing grows on K2's icy upper slopes, but life finds a way lower down. In the deep valleys, people water small oases with channels fed by melting glaciers. Willows and poplars grow along streams, and juniper grows on high slopes. Britannica describes grassy pastures between the high peaks.

The mountains around K2 are protected in the Central Karakoram National Park. Its wildlife department lists snow leopards, markhor (a kind of wild goat), ibex, blue sheep, musk deer, lynx and wolves, and about 90 kinds of birds. Britannica adds that big birds such as lammergeiers and golden eagles soar on the mountain winds.

Britannica notes that almost all lush vegetation in the lower Karakoram valleys is shaped by people: mountain oases on rocky outcrops are watered by intricate channels from glacial melt. The range has an upper tree line set by cold and a lower one set by aridity, with only sparse trees between; willow, poplar and oleander thickets line watercourses up to about 3,000 m, juniper grows among high seasonal snowfields, and Artemisia shrubs thinly cover the lower slopes.

The Central Karakoram National Park, declared in 1993 and covering about 10,558 km², is described by the Gilgit-Baltistan Forest, Wildlife and Environment Department as Pakistan's largest protected area; glaciers cover about 38 percent of it. The department lists snow leopard, markhor, musk deer, urial and Marco Polo sheep among threatened species, with blue sheep, ibex, lynx and wolf, and about 90 bird species, and names over-hunting, habitat loss and isolation of small populations as pressures on snow leopards and markhor. Britannica adds Himalayan griffons, lammergeiers and golden eagles.

Snow leopard in Ähtäri Zoo
Photo: kallerna, CC BY-SA 3.0, via Wikimedia Commons

Measured, named and climbed

Long ago, a map maker measured the mountains here.

He wrote K2 next to this one, and the name stuck. Many years later, two climbers reached the top. In 2021, ten climbers from Nepal reached the top in winter.

In 1856, Thomas Montgomerie of the Survey of India was measuring the Karakoram. He labeled the peaks K1, K2 and so on, and this mountain was the second one he measured. Its other English name, Mount Godwin Austen, honors H. H. Godwin Austen, its first surveyor.

Climbers tried for more than 50 years to reach the top. Teams in 1902, 1909, 1938, 1939 and 1953 turned back. Then, on 31 July 1954, Achille Compagnoni and Lino Lacedelli of an Italian expedition stood on the summit. On 16 January 2021, ten climbers from Nepal reached the top together, making the first winter climb of K2.

Britannica records that Col. T. G. Montgomerie of the Survey of India discovered the peak in 1856 and gave it the symbol K2 as the second peak measured in the Karakoram; the name Mount Godwin Austen honors Col. H. H. Godwin Austen, its first surveyor. An Anglo-Swiss expedition made the first attempt in 1902, reaching about 5,670 m on the northeast ridge; the Duke of the Abruzzi's Italian expedition of 1909 reached about 6,100 m on the southeast ridge, later called the Abruzzi Ridge; American expeditions reached about 7,925 m (1938), 8,380 m (1939) and 7,900 m (1953).

In 1954 an Italian expedition led by the geologist Ardito Desio, including a Pakistani member, climbed the Abruzzi Ridge, and Achille Compagnoni and Lino Lacedelli reached the summit at 6 p.m. on 31 July. Britannica counts K2 among the world's most difficult mountains to climb because of its frequent, severe storms. It was the last of the fourteen 8,000-meter peaks climbed in winter: on 16 January 2021 ten Nepali climbers from three teams, among them Nirmal Purja and Mingma G Sherpa, reached the top together (National Geographic; Planet Mountain).

K2 from Broad Peak Base Camp
Photo: Zacharie Grossen, CC BY-SA 4.0, via Wikimedia Commons

Visiting safely

K2 is very high, very cold and very far away.

Only expert climbers try to reach the top. Hikers who visit go with guides. Up high, tell a grown-up if your head hurts.

K2 stands in a remote land of glaciers, far from roads and towns, so visitors travel with experienced local guides. The climb to the summit is only for highly skilled mountaineers. To protect this fragile place, the national park has set routes where tourists may go, with basic facilities.

For walkers, one big danger is the height itself. The US Centers for Disease Control and Prevention (CDC) says altitude sickness can start for people sleeping at about 2,450 meters or higher, and that children get it as easily as adults. A headache is the main sign. Climb slowly, and go down if you feel worse.

The approach to K2 runs through the Central Karakoram National Park, whose managers divide it into a buffer zone near settlements and a core zone of higher protection, where tourists may enter only along designated corridors with basic facilities. Glaciers cover about 38 percent of the park, and Britannica describes thin air, intense sunlight, strong winds and large swings between day and night temperatures across the high Karakoram.

Altitude illness is the main hazard for trekkers. The CDC Yellow Book says unacclimatized travelers are at risk at sleeping altitudes of 2,450 m or more, that children are as susceptible as adults, and that above 3,000 m sleeping altitude should rise by no more than 500 m a night; travelers should descend if symptoms worsen despite rest. The summit itself is a technical mountaineering objective for expert, well-supported teams.

Amazing facts

  • K2 got its name from a list of mountains.

    The name K2 means the second peak measured in the Karakoram. A surveyor wrote it down in 1856, and the short name stuck.

    Montgomerie of the Survey of India assigned the symbol K2 in 1856 because it was the second peak measured in the Karakoram Range.

  • Ten climbers stood on top of K2 together in winter.

    On 16 January 2021, ten climbers from Nepal waited just below the summit so they could step onto the top of K2 together.

    The first winter ascent, on 16 January 2021, was made by ten Nepali climbers from three teams who regrouped just below the summit and reached it together.

  • A glacier near K2 slides about 2 meters every day.

    The Baltoro Glacier, which flows past K2, moves about 2 meters a day. Some other glaciers in the region move only about 30 centimeters a day.

    Britannica gives the Baltoro Glacier a rate of about 2 m a day, against about 30 cm a day for the Khumbu Glacier below Everest.

  • Snow on high mountains here can form tall spiky shapes.

    In the extreme conditions of the high Karakoram snowfields, snow can form spiky lumps called snow penitents. Some are a meter tall or more.

    Britannica notes that extreme conditions in Karakoram snowfields produce Büsserschnee, 'snow penitents': ablated snow hummocks one meter or more tall.

Words to know

summit
the very top of a mountain
glacier
a huge mass of ice that moves slowly downhill
surveyor
a person who measures land, heights and distances very exactly
base camp
the main camp at the foot of a mountain, where climbers rest and store supplies
ascent
a climb up to the top
altitude
how high a place is above the level of the sea

Discovery challenge

  1. Which mountain is taller than K2?

    Which is the only mountain in the world taller than K2?

    K2 (8,611 m) is second only to which summit?

    • Mount Everest
    • Mont Blanc
    • Mount Kilimanjaro
    Show the answer

    Mount Everest

    Mount Everest! K2 is the second tallest.

    Mount Everest, 8,849 meters; K2 is 8,611 meters.

    Mount Everest; K2 is the second highest summit on Earth.

  2. Where does the name K2 come from?

    Why did the surveyor Montgomerie call this mountain K2?

    What does the symbol K2, assigned in 1856, record?

    • It was the second peak he measured in the Karakoram
    • It has two summits
    • It was the second mountain ever climbed
    Show the answer

    It was the second peak he measured in the Karakoram

    It was number 2 on a list of Karakoram mountains.

    K stands for Karakoram, and 2 because it was the second peak he measured.

    It was the second peak measured in the Karakoram Range by the Survey of India.

  3. What are the rivers of ice around K2 called?

    What are the huge, slowly moving masses of ice that flow around K2 called?

    What kind of feature are the Baltoro and Godwin Austen, which flow past K2?

    • Glaciers
    • Volcanoes
    • Sand dunes
    Show the answer

    Glaciers

    Glaciers! They are rivers of ice.

    Glaciers; the Baltoro Glacier moves about 2 meters a day.

    Glaciers; K2 rises from the Godwin Austen Glacier, a tributary of the Baltoro.

  4. When did people first reach the top of K2?

    In which year did Compagnoni and Lacedelli first reach the summit of K2?

    In which year did the Italian expedition led by Ardito Desio make the first ascent?

    • 1856
    • 1954
    • 2021
    Show the answer

    1954

    In 1954, about 70 years ago.

    In 1954, on 31 July. The first winter climb came in 2021.

    1954, via the Abruzzi Ridge; 1856 is the survey, 2021 the first winter ascent.

  5. Who made the first climb of K2 in winter?

    Who made the first winter climb of K2, in January 2021?

    Who made the first winter ascent of K2, on 16 January 2021?

    • A team of ten climbers from Nepal
    • One climber alone
    • A team of scientists in a helicopter
    Show the answer

    A team of ten climbers from Nepal

    Ten climbers from Nepal, all together.

    Ten Nepali climbers, who stepped onto the summit together.

    Ten Nepali climbers from three teams, including Nirmal Purja and Mingma G Sherpa.

Nearby places

Experiments to try

Explore next

For parents & teachers

What children will learn

  • Locate K2 in the Karakoram Range and compare its height with Mount Everest's.
  • Explain how folding, uplift and glaciers shaped the Karakoram's peaks.
  • Describe how K2 got its name and the main steps in its climbing history.
  • Explain why high altitude affects people and how trekkers stay safe.

Recommended ages: 3 to 17 · About 15 minutes

Talk about it

  • K2 was named with a letter and a number. Would you rather a mountain have a code name or a local name? Why?
  • Why do you think teams kept trying to climb K2 for more than 50 years?
  • Why might a national park allow visitors only on certain routes?

Try at home or in class

  • Make a 'glacier' from a cup of slime or thick dough on a tilted tray with sprinkled sand on it; watch it creep slowly downhill and carry the sand along.
  • Draw a bar chart of K2 (8,611 m), Mount Everest (8,849 m) and Mont Blanc (4,807 m) on squared paper, one square for every 500 meters.

Key vocabulary: summit, glacier, surveyor, base camp, ascent, altitude

Where these facts come from

  1. Wikidata , Wikimedia Foundation (CC0 1.0)
  2. Natural Earth vector data , Natural Earth (NACIS) (Public domain)
  3. K2 , Encyclopaedia Britannica
  4. Mount Everest , Encyclopaedia Britannica
  5. Karakoram Range , Encyclopaedia Britannica
  6. Himalayas: Drainage , Encyclopaedia Britannica
  7. Central Karakoram National Park , Forest, Wildlife & Environment Department, Government of Gilgit-Baltistan
  8. Nepali Mountaineers Achieve Historic Winter First on K2 , National Geographic
  9. K2: Nepalese mountaineers claim historic first winter ascent , Planet Mountain
  10. High-Altitude Travel and Altitude Illness (CDC Yellow Book) , U.S. Centers for Disease Control and Prevention
  11. Wikimedia Commons , Wikimedia Foundation (Per file (public domain, CC0, CC BY or CC BY-SA); see each media record)

Checked, not yet human-reviewed. Last updated October 27, 2026. Spotted a mistake? Tell us.

Picture credits
  • Photo: Zacharie Grossen, CC BY-SA 4.0, via Wikimedia Commons · source · license
  • Photo: kallerna, CC BY-SA 3.0, via Wikimedia Commons · source · license