The Cordillera Huayhuash is a compact but extraordinary mountain range in the central Peruvian Andes, known for steep glaciated summits, turquoise alpine lakes, high mountain passes, and some of the most technically challenging peaks in South America. Although the main range extends for only about 30 kilometers (19 miles), it contains an exceptional concentration of mountains rising above 5,000 and 6,000 meters.
At the center of the range is Yerupajá, which reaches approximately 6,634 meters (21,765 feet) and is the second-highest mountain in Peru after Huascarán. Other famous Huayhuash summits include Siula Grande, Jirishanca, Sarapo, Yerupaja Chico, and Rasac.
The range is equally famous among trekkers. The Huayhuash Circuit circles much of the massif through remote valleys, high passes, traditional Andean communities, glacial basins, and some of the most dramatic mountain scenery in Peru.
🏔️ Overview
The Cordillera Huayhuash is part of the enormous Andes mountain system of western South America. It lies south of the much larger Cordillera Blanca, but the Huayhuash has a distinctly different character.
Rather than forming a long chain extending for hundreds of kilometers, the Huayhuash consists of a tightly concentrated group of extremely steep peaks.
Peru’s National Service for Natural Areas Protected by the State, or SERNANP, describes the protected massif as containing 21 snow-covered mountains. The landscape also contains glaciers, high-altitude grasslands, wetlands, glacial lakes, steep rock walls, and deeply carved valleys.
The Cordillera Huayhuash is especially important because of its position on a major continental watershed. Rivers flowing from its western side feed drainage systems leading toward the Pacific Ocean, while water from its eastern slopes enters the Marañón system and ultimately the Amazon River.
⚡ Fast Facts
| Feature | Details |
|---|---|
| Continent | South America |
| Country | Peru |
| Regions | Áncash, Huánuco, and Lima |
| Provinces | Bolognesi, Lauricocha, and Cajatambo |
| Mountain System | Andes |
| Approximate Length | 30 km / 19 mi |
| Highest Mountain | Yerupajá |
| Highest Elevation | Approximately 6,634 m / 21,765 ft |
| Second-Highest Major Peak | Siula Grande |
| Protected Area | Cordillera Huayhuash Reserved Zone |
| Reserved Zone Area | 67,589.76 hectares / approximately 167,018 acres |
| Reserved Zone Established | December 20, 2002 |
| Major Trek | Cordillera Huayhuash Circuit |
| Typical Trekking Season | May through September |
| Landscape | Glaciers, high peaks, puna grasslands, lakes, wetlands, and alpine valleys |
📍 Location
The Cordillera Huayhuash lies in west-central Peru, approximately south of the Cordillera Blanca.
The range crosses portions of three Peruvian administrative regions:
- Áncash Region — principally Bolognesi Province
- Huánuco Region — principally Lauricocha Province
- Lima Region — principally Cajatambo Province
This position means that the mountain crest crosses both political boundaries and a major hydrological divide.
On the western side of the range, headwaters eventually contribute to rivers such as the Pativilca and Huaura, which drain toward the Pacific Ocean. On the eastern side, water flows toward the Marañón River, one of the principal headwaters of the Amazon system.
Communities surrounding the range include Llámac, Pacllón, Huayllapa, and Queropalca. These communities play an important role in land management and tourism throughout the Huayhuash.
Chiquián, west of the mountains, is one of the traditional gateway towns for travelers approaching the range.
🏔️ Major Mountains of the Cordillera Huayhuash
Despite its relatively short length, the Huayhuash contains an extraordinary collection of very high mountains.
Elevation figures can vary among Peruvian maps, mountaineering publications, and modern topographic databases, particularly for secondary summits. The following figures represent commonly published elevations.
| Mountain | Approximate Elevation |
|---|---|
| Yerupajá | 6,634 m / 21,765 ft |
| Siula Grande | 6,344 m / 20,814 ft |
| Sarapo | 6,127 m / 20,102 ft |
| Jirishanca | 6,094 m / 19,993 ft |
| Yerupaja Chico | 6,089 m / 19,977 ft |
| Rasac | approximately 6,000–6,020 m / 19,685–19,751 ft |
| Carnicero | approximately 5,960 m / 19,554 ft |
| Rondoy | approximately 5,870 m / 19,259 ft |
| Trapecio | approximately 5,650 m / 18,537 ft |
| Diablo Mudo | approximately 5,350 m / 17,552 ft |
Yerupajá
Yerupajá dominates the northern-central portion of the Cordillera Huayhuash.
At approximately 6,634 meters, it is the highest mountain in the range and second-highest mountain in Peru, surpassed nationally only by Huascarán.
Yerupajá is distinguished by huge ice-covered faces, sharply corniced ridges, hanging glaciers, and formidable technical climbing.
David Harrah and James Maxwell completed the first ascent on July 31, 1950. Their climb became one of the landmark accomplishments of early American mountaineering in the Andes.
Siula Grande
Siula Grande rises southeast of Yerupajá and is generally regarded as the second-highest major summit in the range.
It is internationally famous because of British climbers Joe Simpson and Simon Yates, who made the first ascent of its west face in 1985.
During the descent Simpson suffered a catastrophic leg injury and later fell into a crevasse after an extraordinary sequence of events. His survival became the subject of his book Touching the Void and the later documentary film of the same name.
Siula Grande had originally been climbed in 1936 by Arnold Awerzger and Erwin Schneider.
Jirishanca
Jirishanca is one of the most recognizable mountains in the Huayhuash.
Its steep pyramidal profile and extraordinary combination of rock, snow, and ice have made it one of Peru’s classic technical mountaineering objectives.
After numerous unsuccessful attempts, Toni Egger and Siegfried Jungmair completed the first ascent in 1957.
Jirishanca continues to attract elite alpine climbers attempting difficult routes on its steep faces and ridges.
Rasac
Rasac rises immediately west of the Yerupajá massif.
Published elevations vary, with modern and historical sources placing the summit at roughly 6,000 meters. Erwin Schneider made the first recorded ascent in 1936.
Although Rasac is sometimes described as one of the comparatively more approachable high peaks of the Huayhuash, climbing it remains a serious technical mountaineering undertaking.
🪨 Geology
The Cordillera Huayhuash provides an impressive example of the geological forces that built the Andes.
Much of the range consists of strongly folded and faulted sedimentary rock dating from the Mesozoic Era, particularly the Cretaceous Period. Limestone is especially prominent, together with sandstone, shale, quartzite, and related sedimentary formations.
These rocks originated from sediments deposited long before the modern Andes reached their present elevation.
Tectonic compression subsequently folded, faulted, and thrust these rock layers upward as the Andean mountain system developed.
Geological studies have also documented younger volcanic rocks and igneous intrusions in parts of the region.
At the continental scale, the Andes have developed through the continuing interaction between the Nazca Plate and South American Plate. The oceanic Nazca Plate is being forced beneath the South American Plate, producing crustal shortening, uplift, earthquakes, deformation, and volcanism throughout much of western South America.
❄️ Glaciers and Glacial Landscapes
Glaciation has been another major force shaping the Cordillera Huayhuash.
During colder periods of the Quaternary, glaciers extended much farther down the mountain valleys than they do today. Geological research has identified exceptionally well-preserved moraine sequences that preserve evidence of repeated periods of glacial advance and retreat.
Modern glaciers remain on many of the highest mountains.
Their movement has produced classic glacial landforms including:
- U-shaped valleys
- Cirques
- Moraines
- Glacial basins
- Steeply eroded rock walls
- Glacial lakes
Lakes are consequently one of the defining features of the Huayhuash landscape.
Among the best known are Laguna Carhuacocha, Laguna Jahuacocha, Laguna Viconga, Laguna Mitucocha, Laguna Quesillococha, and Laguna Sarapococha.
Like glaciers elsewhere in the Tropical Andes, glaciers of the Huayhuash are responding to a warming climate. Recent scientific research documents substantial continued glacier shrinkage across Peru and Bolivia.
Changing ice conditions have practical consequences as well. Historic mountaineering routes may become more difficult or dangerous as glaciers thin, crevasses change, ice cliffs retreat, and formerly ice-covered rock becomes exposed.
🌿 Flora and Fauna
Although the Cordillera Huayhuash may initially appear dominated by rock and ice, its high-altitude ecosystems support significant biodiversity.
The larger Cordillera Huayhuash y Nor Oyón Key Biodiversity Area encompasses habitats ranging from approximately 3,650 to 6,600 meters above sea level.
Important ecosystems include:
- Humid puna grassland
- High Andean shrubland
- Bofedales, or high-altitude wetlands
- Glacial environments
- Periglacial environments
- Lakes and lagoons
- Remnant high-Andean woodland
Small stands of Polylepis, commonly known in Peru as queñual, are particularly important. These remarkable trees can survive at elevations where few other trees can grow.
The wider biodiversity area supports numerous high-Andean bird species, including the Andean condor (Vultur gryphus).
The area has been internationally recognized as a Key Biodiversity Area in part because of species with restricted distributions and conservation concerns, including the high-altitude bird Anairetes alpinus and the vulnerable tree Polylepis weberbaueri.
🥾 The Cordillera Huayhuash Circuit
For hikers, the best-known way to experience the range is the Huayhuash Circuit.
Unlike a summit climb, the circuit travels around the mountains rather than over their principal summits. Nevertheless, it is a demanding high-altitude trek.
Route length varies because there are several variations, alternate passes, side trips, and trailheads. A traditional circuit is often described as roughly 120 kilometers (75 miles), while longer variants can substantially exceed that distance.
Classic itineraries commonly take approximately 8 to 12 days, although shorter and longer versions are possible.
Along the route, trekkers encounter:
- High mountain passes
- Glacial lakes
- Remote campsites
- Alpine grasslands
- Traditional Andean communities
- Views of Yerupajá
- Views of Siula Grande
- Views of Jirishanca
- Views of Rasac and Rondoy
- Hot springs near Viconga
Many sections remain above 4,000 meters, while some passes approach or exceed 5,000 meters.
The combination of altitude, remoteness, steep trails, cold nights, rapidly changing weather, and limited services makes the Huayhuash Circuit considerably more demanding than an ordinary backpacking trip.
🏔️ Field Guide Tip: Do not underestimate the altitude simply because the Huayhuash Circuit is a trek rather than a technical climb. Spending several days acclimatizing before beginning the circuit can be extremely important. Current information about trail access, community fees, weather, and local conditions should also be checked before departure.
🧗 Mountaineering in the Huayhuash
The Cordillera Huayhuash occupies an important place in the history of high-altitude alpine climbing.
Early European expeditions explored the range during the 1930s, including expeditions associated with Austrian and German climbers. A number of important peaks were climbed during this period, but some of the most difficult summits remained unconquered.
Yerupajá’s first ascent in 1950 marked one of the major achievements of early postwar Andean mountaineering.
Jirishanca resisted longer. Its first ascent in 1957 required extraordinary climbing for the era.
Later generations of climbers established increasingly difficult routes on Yerupajá, Siula Grande, Jirishanca, and other mountains.
The range remains a venue for cutting-edge alpine climbing today.
The difficulty is not simply the result of altitude. Huayhuash climbers may confront steep ice, unstable snow, limestone rock, mixed terrain, large cornices, crevasses, hanging glaciers, rockfall, icefall, avalanches, and lengthy approaches far from immediate assistance.
Technical climbing in this range should therefore be distinguished from hiking the circuit. The principal summits are expedition-level mountaineering objectives suitable only for properly experienced and equipped climbers.
🛡️ Cordillera Huayhuash Reserved Zone
Much of the massif is protected within the Zona Reservada Cordillera Huayhuash, or Cordillera Huayhuash Reserved Zone.
The Peruvian government established the protected area on December 20, 2002.
SERNANP gives its official area as 67,589.76 hectares, equivalent to approximately 676 square kilometers or 167,018 acres.
The Reserved Zone encompasses portions of Áncash, Huánuco, and Lima and was created to conserve the range’s high-mountain ecosystems, freshwater resources, biodiversity, and exceptional scenery.
A Peruvian Zona Reservada is a protected-area designation used for places recognized as having important conservation value while additional work determines their long-term categorization and management.
Conservation in the Huayhuash is also closely connected with surrounding communities and privately conserved lands. Community organizations are important participants in managing access, tourism, grazing areas, campsites, and conservation initiatives.
💧 Water Resources
The glaciers, snowfields, lakes, and wetlands of the Huayhuash make the mountains an important regional source of freshwater.
SERNANP identifies the western slopes as headwaters for the Pativilca and Huaura river systems.
Eastern drainage ultimately reaches the Marañón River, which forms one of the great headwater systems of the Amazon.
This hydrological position gives the Cordillera Huayhuash significance far beyond its relatively small geographic footprint.
Glacier retreat may increasingly affect seasonal water storage, lake development, downstream hydrology, and high-mountain hazards throughout the Peruvian Andes.
🌤️ Best Time to Visit
The main trekking season is generally May through September, corresponding with the drier part of the year in this portion of the Andes.
June through August are particularly popular because extended periods of clear weather are more common.
However, the high mountains maintain their own weather.
Visitors should remain prepared for:
- Freezing nighttime temperatures
- Snow
- Hail
- Strong ultraviolet radiation
- High winds
- Sudden cloud development
- Rapid temperature changes
The rainy season generally brings less predictable trekking conditions and greater precipitation.
For mountaineers, seasonal averages alone are insufficient. Glacier conditions, snowfall, rockfall, avalanche exposure, cornice development, and individual route conditions can change significantly from year to year.
🧭 Nearby Mountains and Attractions
Cordillera Blanca
The Cordillera Blanca lies north of the Huayhuash and contains Huascarán, Peru’s highest mountain.
Huaraz, the principal mountaineering center for the Cordillera Blanca, is also frequently used by international visitors preparing for Huayhuash expeditions.
Huascarán
Huascarán rises to 6,768 meters and is the highest mountain in Peru.
It belongs to the Cordillera Blanca rather than the Huayhuash, an important distinction because the two ranges are sometimes confused.
Laguna Carhuacocha
Carhuacocha is one of the most spectacular lakes along the Huayhuash trekking circuit.
The area provides famous views toward Jirishanca, Yerupaja Chico, Yerupajá, and Siula Grande.
Laguna Jahuacocha
Jahuacocha lies beneath the western side of the northern Huayhuash.
Its waters are associated with runoff from the Jirishanca and Rasac area, and the lake provides impressive views toward several major summits.
Viconga
The southern Huayhuash contains Laguna Viconga and nearby geothermal hot springs, which have become a popular stop on many versions of the trekking circuit.
💡 Fun Facts
- The main Cordillera Huayhuash is only about 30 kilometers long, yet it contains several mountains exceeding 6,000 meters.
- Yerupajá is Peru’s second-highest mountain, after Huascarán.
- The range spans three Peruvian regions: Áncash, Huánuco, and Lima.
- SERNANP describes the protected massif as containing 21 snow-covered mountains.
- The Huayhuash lies on a continental drainage divide between river systems flowing toward the Pacific Ocean and Amazon basin.
- Siula Grande became internationally famous through Joe Simpson’s Touching the Void.
- The first ascent of Yerupajá was completed in 1950 by James Maxwell and David Harrah.
- Jirishanca remained unclimbed until 1957 despite earlier expeditions attempting the mountain.
- The range contains numerous lakes created or shaped by past glaciation.
- The Cordillera Huayhuash Reserved Zone was established in 2002.
- Parts of the wider region are recognized as a Key Biodiversity Area of global significance.
❓ Frequently Asked Questions
Where is the Cordillera Huayhuash?
The Cordillera Huayhuash is located in the central Peruvian Andes, spanning portions of the Áncash, Huánuco, and Lima regions.
What is the highest mountain in the Cordillera Huayhuash?
Yerupajá is the highest mountain in the range at approximately 6,634 meters (21,765 feet).
Is Yerupajá the highest mountain in Peru?
No. Yerupajá is the second-highest mountain in Peru. Huascarán, in the Cordillera Blanca, is higher at 6,768 meters.
Is the Cordillera Huayhuash part of the Cordillera Blanca?
No. They are separate mountain ranges.
The Cordillera Huayhuash lies south of the much longer Cordillera Blanca. Both are part of the Peruvian Andes.
How long is the Cordillera Huayhuash?
The principal high mountain chain is approximately 30 kilometers (19 miles) long.
How long is the Huayhuash Circuit?
There is no single fixed distance because several versions exist. A traditional circuit is often approximately 120 kilometers (75 miles), with longer variations possible.
How many days does the Huayhuash Circuit take?
Many classic itineraries require approximately 8 to 12 days, although the duration varies according to route, acclimatization, side trips, and trailhead.
Is the Huayhuash Circuit difficult?
Yes.
Although it is a trekking route rather than a technical mountaineering route, much of the journey occurs above 4,000 meters and involves remote camps, high passes, cold temperatures, and substantial daily elevation change.
What is Siula Grande famous for?
Siula Grande is particularly famous because of Joe Simpson and Simon Yates’s 1985 ascent of the west face and Simpson’s extraordinary survival during their descent. Simpson later described the experience in Touching the Void.
What is the best time to trek in the Cordillera Huayhuash?
The main recommended season is generally May through September, when conditions tend to be drier.
Are there glaciers in the Cordillera Huayhuash?
Yes. Glaciers remain on many of the range’s highest mountains, although glaciers throughout the Peruvian Andes have undergone substantial retreat.
Is the Cordillera Huayhuash protected?
Yes. Much of the massif lies within the Cordillera Huayhuash Reserved Zone, established by Peru in 2002 and covering 67,589.76 hectares.
Can beginners trek the Cordillera Huayhuash?
The circuit does not normally require technical climbing skills, but it should not be treated as a beginner-level hike. The extreme altitude, remoteness, weather, and long days make adequate fitness, acclimatization, preparation, and appropriate equipment important.
🔗 Related Articles
- Yerupajá — The highest mountain in the Cordillera Huayhuash
- Siula Grande — Famous for Touching the Void and its formidable alpine climbing
- Jirishanca — One of the most technically challenging peaks in Peru
- Rasac — A major high summit beside Yerupajá
- Cordillera Blanca — Peru’s neighboring high mountain range
- Huascarán — The highest mountain in Peru
- Major Mountain Ranges in South America — Explore the continent’s major mountain systems
📚 Sources
- SERNANP — Zona Reservada Cordillera Huayhuash — official protected-area location, watersheds, mountains, and Yerupajá elevation.
- SERNANP — Cordillera Huayhuash Reserved Zone Research Information — protected-area objectives and official area of 67,589.76 hectares.
- Peru Travel — Cordillera Huayhuash — official Peruvian tourism information on trekking and the range.
- Key Biodiversity Areas — Cordillera Huayhuash y Nor Oyón — ecosystems, elevation range, biodiversity, Polylepis woodland, communities, and conservation significance.
- Geological Society of America Bulletin — Structural Evolution of the Cordillera Huayhuash — geological structure, folded sedimentary rocks, and tectonic history.
- Quaternary Science Reviews — Geochronology of Quaternary Glaciations from the Tropical Cordillera Huayhuash, Peru — scientific research on past glaciation and moraine chronology.
- Annals of Glaciology — Glacier Shrinkage in the Peruvian and Bolivian Andes, 2016–2024 — recent scientific assessment of glacier loss across the Peruvian and Bolivian Andes.
- American Alpine Club — Up Yerupajá — first-ascent account of Yerupajá by the 1950 expedition.
- American Alpine Club — Jirishanca: A Climbing History — historical information on exploration and climbing of Jirishanca.
- American Alpine Club — Siulá Grande, East Face — modern climbing history and technical information for Siula Grande.
