Nangpai Gosum

Nangpai Gosum | Cho Aui

Winter Magic in Nepal’s Khumbu Region | Jonathan Poelman

Rising along the remote frontier between Nepal and Tibet, Nangpai Gosum is a 7,350-meter-class Himalayan mountain standing immediately southwest of Cho Oyu, the sixth-highest mountain in the world. The peak belongs to the Mahalangur Himal, the same great section of the Himalayas that contains Everest, Lhotse, Makalu, and several of Earth’s highest 7,000-meter summits.

Nangpai Gosum is also known by an unusually complicated collection of names, including Cho Aui, Jasamba, Jasemba, and Pasang Lhamu Chuli. Nepal officially renamed the western summit Pasang Lhamu Chuli in honor of Pasang Lhamu Sherpa, the first Nepalese woman to summit Mount Everest.

The mountain reaches approximately 7,350 meters (24,114 feet) and possesses about 426 meters (1,398 feet) of topographic prominence. Its nearest higher neighbor is Cho Oyu, only about five kilometers away.

Despite its great height, Nangpai Gosum receives remarkably little climbing traffic. A Japanese expedition completed its first ascent from Tibet in October 1986, and only a small number of subsequent expeditions have established routes on its steep snow, ice, and mixed faces.

⚡ Fast Facts

Feature	Details
Countries	Nepal and China
Nepal Province	Koshi Province
China Region	Tibet Autonomous Region
Mountain Range	Mahalangur Himal, Himalayas
Elevation	Approx. 7,350 m / 24,114 ft
Nepal Official Elevation	7,350–7,351 m
Prominence	Approx. 426 m / 1,398 ft
Isolation	Approx. 5 km / 3 mi
Nearest Higher Neighbor (NHN)	Cho Oyu
Parent Peak	Cho Oyu
Coordinates	Approx. 28.073° N, 86.614° E
Other Names	Cho Aui, Jasamba, Jasemba, Pasang Lhamu Chuli
Official Nepali Name	Pasang Lhamu Chuli
First Ascent	October 12, 1986
First-Ascent Route	Northwest Ridge from Tibet
First-Ascent Expedition	Himalayan Association of Japan
Notable Distinction	One of the world’s highest subsidiary Himalayan summits

The nomenclature of the Nangpai Gosum group has changed considerably. Some modern mountaineering sources reserve “Nangpai Gosum I” for another summit farther east along the ridge, while older maps and Mountain Field Guide usage apply Nangpai Gosum to the 7,350-meter western summit now officially called Pasang Lhamu Chuli in Nepal.

🗺️ Where Is Nangpai Gosum?

Nangpai Gosum stands directly on the Nepal–China border, northwest of the upper Khumbu region and immediately west-southwest of Cho Oyu.

On the Nepalese side, the mountain rises above the remote upper valleys of Sagarmatha National Park.

On the northern side lies Tibet’s high plateau.

The summit is only about five kilometers from Cho Oyu, but enormous glaciers, high ridges, and technical mountain terrain separate the two.

The nearby Nangpa La is one of the most historically important passes across the Himalayas.

For centuries, Sherpa and Tibetan traders used this high corridor to move between the Khumbu valleys and Tibet.

Nangpai Gosum therefore occupies not merely a geographical border but a landscape that has long connected communities on opposite sides of the Himalayan divide.

🧭 Nearest Higher Neighbor: Cho Oyu

Nangpai Gosum’s Nearest Higher Neighbor is Cho Oyu.

Cho Oyu reaches 8,188 meters (26,864 feet) and is the sixth-highest mountain on Earth.

Depending on the topographic dataset and the precise summit coordinates used for Nangpai Gosum, the nearest higher terrain lies approximately 4 to 5.3 kilometers away.

That small distance helps explain the mountain’s modest prominence.

Although Nangpai Gosum rises above 7,300 meters, the saddle connecting it toward Cho Oyu remains extremely high.

Its topographic prominence is approximately 426 meters (1,398 feet).

For comparison, many independent Himalayan mountains possess more than 1,000 meters of prominence.

Nangpai Gosum is therefore enormously high but geographically connected to the greater Cho Oyu mountain system.

🏔️ Nangpai Gosum or Pasang Lhamu Chuli?

Few Himalayan mountains have more confusing names.

The 7,350-meter western summit has historically appeared under several names:

Nangpai Gosum
Nangpai Gosum I
Cho Aui
Cho Aui I
Jasamba
Jasemba
Pasang Lhamu Chuli

The confusion developed through a mixture of Tibetan names, Nepalese naming decisions, different expedition maps, and later attempts to classify the multiple summits along the ridge.

Older climbing reports typically called the mountain Cho Aui.

Other maps used Jasamba or Jasemba.

The name Nangpai Gosum I was also frequently applied to the same summit.

Nepal later officially named it Pasang Lhamu Chuli.

👩 Who Was Pasang Lhamu Sherpa?

The official Nepali name honors Pasang Lhamu Sherpa, one of the most important figures in Nepalese mountaineering history.

On April 22, 1993, Pasang Lhamu became the first Nepalese woman to reach the summit of Mount Everest.

Her achievement was celebrated throughout Nepal.

Tragically, she died during the descent.

Her death transformed her into a national symbol of courage and determination, and Nepal subsequently commemorated her in numerous ways.

The mountain formerly known as Jasamba or Nangpai Gosum I was renamed Pasang Lhamu Chuli.

The official Nepalese mountaineering list currently records Pasang Lhamu Chuli at approximately 7,350 meters in the Mahalangur Himal.

🧩 The Nangpai Gosum Naming Puzzle

The story becomes more complicated because the ridge contains several additional high summits.

In later mountaineering literature, climbers proposed applying the names Nangpai Gosum I, II, and III to three high tops farther along the ridge between Pasang Lhamu Chuli and Cho Oyu.

As a result, a modern climbing report might use “Nangpai Gosum I” for a summit that is not the same peak older sources called Nangpai Gosum I.

This has produced apparent contradictions in first-ascent records.

For example:

The 7,350-meter Cho Aui/Pasang Lhamu Chuli was first climbed in 1986.
A different summit later designated Nangpai Gosum I was climbed much later.
Nangpai Gosum II has its own distinct climbing history.

When comparing expedition reports, it is therefore essential to check the coordinates and route rather than relying on the name alone.

For this Mountain Field Guide profile, Nangpai Gosum refers to the approximately 7,350-meter western summit also known as Cho Aui and officially called Pasang Lhamu Chuli in Nepal.

📏 How High Is Nangpai Gosum?

Published elevations vary slightly.

Common figures include:

7,350 m
7,351 m
7,352 m
7,354 m

Nepal’s Department of Tourism lists Pasang Lhamu Chuli at 7,350 meters, while historical expedition accounts commonly used 7,351 or 7,354 meters.

Peakbagger uses approximately 7,350 meters (24,114 feet).

Differences of a few meters are common among remote Himalayan summits.

Older measurements relied on:

Survey maps
Photogrammetry
Barometric altimeters
Expedition observations

Modern digital elevation datasets may produce slightly different results.

For practical purposes, Nangpai Gosum can safely be described as a 7,350-meter mountain.

🌏 Part of the Mahalangur Himal

Nangpai Gosum belongs to the Mahalangur Himal, one of the most extraordinary mountain regions on Earth.

The Mahalangur section of the Himalayas contains an almost unbelievable concentration of high summits.

Major mountains include:

Mount Everest
Lhotse
Makalu
Cho Oyu
Gyachung Kang
Ngojumba Kang
Pumori
Baruntse
Nangpai Gosum

Four of Earth’s fourteen traditional 8,000-meter mountains occur within this broader section.

Nangpai Gosum would be an extraordinary giant almost anywhere else.

Here, its 7,350-meter summit can appear secondary simply because it stands beside Cho Oyu.

🪨 Geology of Nangpai Gosum

Nangpai Gosum formed through the same extraordinary tectonic processes that created the rest of the Himalayas.

The mountain is not volcanic.

Its rocks ultimately owe their position to the continuing collision between the Indian Plate and Eurasian Plate.

India was once separated from Asia by the Tethys Ocean.

As the Indian Plate moved northward, that ocean gradually closed.

Eventually the continental masses collided.

Because continental crust is relatively buoyant, large amounts of rock were compressed rather than simply disappearing into the mantle.

The crust:

Folded
Faulted
Thickened
Metamorphosed
Thrust upward

The result was the Himalayan mountain system.

That collision continues today.

🌍 The Himalayas Are Still Rising

The Himalayas are geologically young and active.

The Indian Plate continues moving generally northward relative to Eurasia.

That movement stores enormous stress within faults throughout the Himalayan region.

Periodic earthquakes release portions of that accumulated strain.

At the same time, tectonic uplift continues raising mountain terrain.

Erosion works in the opposite direction.

Glaciers grind rock away.

Rivers cut deep valleys.

Avalanches and landslides remove entire sections of steep mountain slopes.

The modern form of Nangpai Gosum therefore represents a constantly changing balance between uplift and erosion.

🧊 A Mountain of Ice

Glaciers dominate the landscape surrounding Nangpai Gosum.

The mountain rises above extensive icefields associated with the upper Nangpa and Khumbu regions.

On the Nepal side, the Nangpai Gosum Glacier has attracted scientific attention in addition to mountaineering interest.

At these elevations, snow accumulates and gradually compresses into glacier ice.

The ice then flows downslope under its own weight.

This movement creates:

Crevasses
Seracs
Icefalls
Snow bridges
Bergschrunds
Moraines

For climbers, glaciers are both approach routes and major hazards.

🔬 Nangpai Gosum Glacier and Ice-Core Science

The Nangpai Gosum Glacier has been used for high-altitude climate research.

In 1998, scientists extracted an approximately 37-meter ice core from a drilling site around 5,700 meters above sea level.

Ice cores can preserve layers of snow that accumulated during previous decades.

Researchers analyze those layers for chemical and physical evidence of past atmospheric conditions.

Studies of the Nangpai Gosum core have examined isotopes including:

Chlorine-36
Cesium-137

Some of these substances provide recognizable markers associated with atmospheric nuclear testing during the twentieth century.

The research demonstrates how remote Himalayan glaciers can preserve evidence of global atmospheric events.

🌡️ A Changing Glacier Landscape

Glaciers throughout the greater Himalayan region are responding to changing climate conditions.

Sagarmatha National Park identifies climate change and glacier monitoring as significant conservation concerns.

Warming affects Himalayan climbing in multiple ways.

Potential changes include:

Glacier thinning
Retreating glacier fronts
Different crevasse patterns
Unstable ice cliffs
Changing snow accumulation
Greater rockfall exposure
Changes in seasonal water availability

For a rarely climbed mountain such as Nangpai Gosum, these changes are particularly important.

Older expedition descriptions may no longer accurately represent modern glacier conditions.

🏞️ Nangpa La

Immediately northwest of the mountain lies Nangpa La, a high pass across the Nepal–Tibet frontier.

The pass rises to roughly 5,700–5,800 meters depending on the measurement used.

Despite that extraordinary elevation, Nangpa La has historically been an important trade corridor.

Sherpa traders from Khumbu crossed the pass with yak caravans carrying goods between Nepal and Tibet.

Products moving through the region historically included commodities such as:

Salt
Wool
Grain
Butter
Livestock
Manufactured goods

Historical research documents trade across Nangpa La by at least the early nineteenth century, almost certainly building on older traditions.

This makes the region surrounding Nangpai Gosum both a mountaineering landscape and an important cultural corridor.

🧗 First Ascent: 1986

The first confirmed ascent of the 7,350-meter summit occurred in October 1986.

The expedition came from the Himalayan Association of Japan and approached through Tibet.

At the time, the mountain was generally known as Cho Aui.

The ten-person team was led by Hiroshi Yajima, whose name is also transliterated as Hiroshi Yashima in some records.

The expedition established base camp near the Gyabrag Glacier at approximately 5,800 meters.

Camp I was placed around 6,100 meters.

The climbers then worked through crevassed glacier terrain and climbed a difficult ice face to gain the mountain’s northwest ridge.

🏆 October 12, 1986

The first summit team consisted of:

Yukitoshi Endo
Yoshihiro Shikoda
Katsushi Emura
Katso Matsuki

They left their upper camp on October 11.

Deep snow made progress exhausting.

At roughly 7,200–7,300 meters, the climbers were forced to bivouac.

The following morning they continued along the narrow summit ridge.

At approximately 12:59 p.m. on October 12, 1986, the four climbers reached the summit.

Two days later, the remaining six expedition members also climbed to the top.

Remarkably, all ten members of the expedition eventually reached the summit.

🧗 The Second Summit Team

The second group reached the summit on October 14.

It included:

Hiroshi Yajima
Mitsuyoshi Onodera
Osamu Sato
Keiji Ishikawa
Toshio Yamada
Omohaka Okubo

The achievement was particularly notable because Nangpai Gosum was a remote, unclimbed 7,000-meter Himalayan mountain with no established route.

The expedition’s northwest ridge became the mountain’s historic first-ascent route.

🏔️ The 1996 West Ridge Ascent

A decade later, climbers approached the mountain from Nepal.

The peak had been opened to foreign expeditions by Nepal in 1995 under the name Pasang Lhamu Chuli.

A Korean expedition attempted the mountain that autumn but retreated around 6,900 meters.

In 1996, an expedition sponsored by the Osaka Alpine Club approached through the Khumbu region.

The team initially considered the south or east side but encountered severe avalanche danger.

They eventually committed to the long western ridge rising from near Nangpa La.

The ridge included steep snow, exposed sections, complicated rock obstacles, and a knife-edge feature the climbers called a “cock’s comb.”

🏆 The 1996 Summit

After establishing high camps and fixing difficult portions of the ridge, the expedition made its summit push.

Mamoru Taniguchi and Toshiyuki Kitamura ultimately reached the summit on October 19, 1996.

Their ascent was historically important because it approached the mountain from the Nepal side before gaining the northwestern ridge system.

The climb demonstrated another way to reach a summit that had seen remarkably little attention since its first ascent ten years earlier.

🧗 New Routes from Nepal

Later expeditions began exploring the mountain’s much steeper southern faces.

In 2004, Slovenian climbers opened a demanding route from the southeast side.

The route involved snow, ice, and mixed climbing, including slopes approaching 55–65 degrees.

It provided the first ascent of the mountain from that side.

Other climbers subsequently attempted or completed routes on the southwest face and south pillar.

These climbs transformed Nangpai Gosum from a largely unknown border summit into a highly respected technical objective among specialist Himalayan alpinists.

🧗 The Southwest Face

One of the mountain’s most striking features is its steep face overlooking the Nepal side.

Unlike the comparatively long ridge systems used by early expeditions, the southwest and southeast faces provide much more direct but substantially more technical climbing.

Hazards include:

Falling ice
Rockfall
Avalanches
Steep mixed terrain
Sustained ice climbing
Difficult retreat
Extreme altitude

Modern ascents have included technically difficult routes climbed in lightweight alpine style.

These expeditions are a very different undertaking from commercial climbing on popular Himalayan peaks.

🧗 Alpine-Style Ascents

In 2009, climbers established an important new route on Pasang Lhamu Chuli’s southeast face.

The ascent was completed in alpine style and involved highly technical ice and mixed terrain.

The route was named Hook or Crook and graded approximately VI, WI6, M5.

That grading immediately demonstrates the seriousness of the mountain.

A climb at more than 7,000 meters becomes far harder than an equivalent technical route in the Alps because climbers must perform difficult movements while severely deprived of oxygen.

Cold, exhaustion, storms, and retreat difficulties magnify every mistake.

⚠️ Why Nangpai Gosum Is So Difficult

Nangpai Gosum is not an ordinary trekking peak.

Nor is it a commonly guided 7,000-meter expedition.

Major hazards include:

🧊 Crevasses

Glaciers surrounding the mountain contain deep crevasses, often hidden beneath snow.

❄️ Avalanches

Steep faces accumulate large quantities of wind-loaded snow.

Historical expeditions have abandoned potential routes because of repeated avalanche activity.

🧗 Technical Ice

Several established lines involve steep ice and mixed climbing.

🪨 Rockfall

Steep faces can release rock, especially when temperature changes destabilize frozen terrain.

🌬️ High Winds

Strong winds frequently affect the Nepal–Tibet watershed.

🫁 Extreme Altitude

At 7,350 meters, climbers operate far above the elevations at which the human body can properly acclimatize.

🧭 Remoteness

There is no routine rescue infrastructure or established commercial climbing system comparable with Everest.

🫁 Life at 7,350 Meters

The summit lies deep within the extreme-altitude zone.

Above approximately 7,000 meters, atmospheric pressure is dramatically lower than at sea level.

Climbers experience:

Reduced oxygen availability
Rapid fatigue
Slower thinking
Dehydration
Loss of appetite
Poor sleep
Greater frostbite risk

Serious altitude illnesses can develop, including:

High-altitude pulmonary edema
High-altitude cerebral edema

These conditions can become fatal without rapid descent.

On highly technical terrain, descent may itself require hours of rappelling or difficult climbing.

That combination of altitude and technical difficulty helps explain why Nangpai Gosum has never attracted large numbers of expeditions.

🎫 Climbing Permits

Nepal officially lists the mountain as Pasang Lhamu Chuli among peaks opened for mountaineering expeditions.

The listed Nepalese approach travels through the greater Khumbu region.

A typical expedition may pass through areas associated with:

Lukla
Namche Bazaar
Khumjung
Thame
Upper Nangpa Valley
Base camp

Because the mountain lies directly on an international border, expedition planning can be substantially more complicated than climbing a mountain entirely within Nepal.

Access arrangements, permits, border restrictions, and climbing regulations can change.

Prospective expeditions should therefore rely on current information from Nepal’s Department of Tourism rather than historical climbing reports.

🌿 Flora and Fauna

Nangpai Gosum’s summit is far too high for conventional plant or animal communities.

Above 7,000 meters, the landscape consists almost entirely of:

Snow
Glacier ice
Exposed rock
Wind
Extreme cold

The Nepalese approach, however, passes through the broader ecosystem of Sagarmatha National Park, one of the world’s most extraordinary high-elevation protected landscapes.

Vegetation changes dramatically with altitude.

🌲 Forests

At lower elevations of the Khumbu, forests contain trees such as:

Pine
Hemlock
Silver fir
Birch
Rhododendron
Juniper

Above approximately 3,500 meters, forests become progressively lower and more open.

Eventually trees disappear altogether.

🌱 Alpine Vegetation

Higher slopes support hardy vegetation including:

Dwarf shrubs
Juniper
Rhododendron
Grasses
Sedges
Cushion plants
Mosses
Lichens

Growing seasons are extremely short.

Plants must survive freezing temperatures, strong winds, thin soils, and intense ultraviolet radiation.

Beyond roughly 5,000–5,500 meters, vegetation becomes increasingly scarce.

The upper Nangpai Gosum massif is essentially a nival landscape of rock and ice.

🐆 Wildlife

Sagarmatha National Park protects several characteristic Himalayan mammals.

They include:

Snow leopard
Himalayan tahr
Ghoral
Musk deer
Himalayan black bear
Wolf
Lynx
Pika
Weasel

Most occupy habitats far below Nangpai Gosum’s summit.

Snow leopards can use exceptionally rugged high terrain, but even these highly adapted predators depend on prey populations occupying lower rocky slopes.

Himalayan tahr and ghoral move with remarkable agility across steep mountainsides.

Musk deer generally favor forest and shrub environments lower in the valleys.

🦅 Birds

The greater Khumbu also supports notable high-mountain birds, including:

Himalayan monal
Blood pheasant
Snowcock
Snow pigeon
Red-billed chough
Yellow-billed chough
Himalayan griffon
Bearded vulture

Choughs are particularly remarkable because they can fly and forage at extremely high elevations.

They are among the few conspicuous animals climbers may encounter well above ordinary vegetation zones.

🏞️ Sagarmatha National Park

The Nepalese slopes of the Nangpai Gosum region lie within the northern reaches of Sagarmatha National Park.

The park was established in 1976 and became a UNESCO World Heritage Site in 1979.

It protects approximately 1,148 square kilometers of extraordinary Himalayan terrain, including:

Mount Everest
Lhotse
Cho Oyu
High glaciers
Deep valleys
Alpine ecosystems
Sherpa settlements
Historic trade routes

UNESCO recognizes the park both for its extraordinary mountain scenery and for the relationship between Sherpa culture and the high Himalayan environment.

Its northern boundary follows the international Nepal–China border.

Nangpai Gosum stands directly along that great divide.

🧑‍🤝‍🧑 Sherpa Culture and the Nangpa Valley

The western Khumbu valleys around Nangpa La have strong historical connections with Sherpa communities.

Sherpas established settlements in the Khumbu centuries ago and developed trade, pastoral, religious, and travel networks throughout the mountains.

Nangpa La became one of the most important links with Tibet.

Yak caravans crossed terrain that modern visitors would consider an extreme high-altitude expedition.

These journeys demonstrate how differently local Himalayan communities have historically understood the landscape.

The mountains were not simply isolated wilderness.

They were part of networks connecting:

Villages
Grazing areas
Monasteries
Markets
Families
Religious landscapes

Understanding Nangpai Gosum therefore requires looking beyond modern climbing history.

⛰️ Nearby Mountains

Nangpai Gosum lies among some of the greatest mountains on Earth.

Cho Oyu

Cho Oyu reaches 8,188 meters immediately east-northeast of Nangpai Gosum.

It is Nangpai Gosum’s parent peak and Nearest Higher Neighbor.

Melungtse

Melungtse rises to approximately 7,181 meters west of Nangpai Gosum in the Rolwaling Himal.

Interestingly, Nangpai Gosum is Melungtse’s own Nearest Higher Neighbor.

Siguang Ri

Siguang Ri rises to approximately 7,308 meters north of the Cho Oyu area on the Tibetan side of the Himalayas.

Like Nangpai Gosum, it remains far less famous than nearby 8,000-meter peaks.

Mount Everest

Mount Everest rises southeast of the Nangpa region to 8,848.86 meters, the highest point on Earth above sea level.

The entire landscape belongs to the greater Mahalangur Himal.

📊 Nangpai Gosum vs. Cho Oyu

The comparison with neighboring Cho Oyu demonstrates why Nangpai Gosum receives relatively little public attention despite its extraordinary height.

Feature	Nangpai Gosum	Cho Oyu
Elevation	~7,350 m	8,188 m
Prominence	~426 m	~2,344 m
NHN	Cho Oyu	Mount Everest
First Ascent	1986	1954
Climbing Traffic	Very low	Relatively high
Commercial Expeditions	Rare	Historically common
Mountain Character	Technical ridge and face climbing	Large glaciated 8,000er
Countries	Nepal / China	Nepal / China

Cho Oyu is far more independent and almost 840 meters higher.

Nangpai Gosum, however, has attracted technically ambitious climbers precisely because it lacks a heavily established commercial route.

❓ Frequently Asked Questions

Is Nangpai Gosum the same mountain as Pasang Lhamu Chuli?

Under the historical naming convention used for the western 7,350-meter summit, yes. The peak was known as Cho Aui, Jasamba, and Nangpai Gosum I before Nepal officially renamed it Pasang Lhamu Chuli.

Later mountaineering literature reassigned the Nangpai Gosum I name to another high point farther along the ridge, so always check the coordinates when comparing sources.

How high is Nangpai Gosum?

The mountain is approximately 7,350 meters (24,114 feet) high. Nepalese sources sometimes use 7,351 meters, while older expeditions reported as much as 7,354 meters.

What is Nangpai Gosum’s Nearest Higher Neighbor?

Its Nearest Higher Neighbor is Cho Oyu.

When was Nangpai Gosum first climbed?

The first confirmed ascent occurred on October 12, 1986, when Yukitoshi Endo, Yoshihiro Shikoda, Katsushi Emura, and Katso Matsuki of a Japanese expedition reached the summit from Tibet.

Is Nangpai Gosum commonly climbed?

No. It has received relatively few documented ascents compared with famous Himalayan peaks.

Is Nangpai Gosum a trekking mountain?

No. It is a serious technical expedition peak exceeding 7,000 meters and requires advanced Himalayan mountaineering experience.

⭐ Why Nangpai Gosum Is Special

Nangpai Gosum is a perfect example of how extraordinary mountains can remain obscure when they stand among even larger giants.

At roughly 7,350 meters, it is higher than almost every mountain on Earth.

Yet only a few kilometers away rises 8,188-meter Cho Oyu, while Everest dominates the same greater mountain region.

Its name tells another story.

Cho Aui, Jasamba, Nangpai Gosum I, and Pasang Lhamu Chuli have all identified the same western border summit at different points in its mapping and mountaineering history.

The modern Nepalese name commemorates Pasang Lhamu Sherpa, whose 1993 Everest ascent became a landmark in Nepalese history.

Its climbing record is equally compelling.

A ten-member Japanese expedition completed the first ascent from Tibet in 1986, eventually placing every team member on the summit. Later expeditions explored increasingly difficult routes from Nepal across steep ice and mixed faces.

Below those faces lies the historic Nangpa corridor, used for generations by Sherpa and Tibetan traders.

Nearby glaciers have even preserved atmospheric evidence used by scientists to reconstruct environmental history.

Nangpai Gosum is therefore much more than an obscure Himalayan summit.

It is a place where extreme-altitude mountaineering, Himalayan tectonics, glacier science, Sherpa history, international borders, and one of Nepal’s most important mountaineering legacies converge beneath the shadow of Cho Oyu.

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