Longest and Highest Mountain Range in the World — Complete 2026 Guide

The longest and highest mountain range in the world is not a single mountain range — it is two different mountain ranges depending on what you measure. The Andes Mountains are the longest mountain range above sea level at 7,000 km along South America. The Himalayas are the highest mountain range, containing 9 of the 10 tallest mountains on earth including Mount Everest at 8,848.86 m. If you count underwater mountain ranges, the Mid-Atlantic Ridge stretches over 40,000 km — making it the truly longest mountain range on the planet by total distance.

After 10+ years guiding international trekkers through the Himalayas, Majestic Trails Nepal has watched the same confusion play out hundreds of times. People search "longest and highest mountain range in the world" expecting one answer. The truth is more interesting than that — and the Himalayas are only one part of the story.

This complete 2026 guide explains the longest mountain range, the highest mountain range, the 2nd longest and 2nd highest, the top 10 of each, the deadliest peak in the world (the "Killer Mountain"), and which mountain range you can actually trek as a traveler.

Which Is the Highest and Longest Mountain Range in the World?

The highest mountain range in the world is the Himalayas. The longest mountain range above sea level is the Andes. These are two different mountain ranges on two different continents — and the question assumes incorrectly that the longest is also the highest.

Here is the honest breakdown:

• Highest mountain range in the world: The Himalayas (Asia) — maximum altitude 8,848.86 m at Mount Everest
• Longest mountain range above sea level: The Andes (South America) — 7,000 km long
• Longest mountain range overall (including underwater): The Mid-Atlantic Ridge — 40,000+ km

The Himalayas contain 9 of the 10 highest mountains on earth. The Andes are more than twice as long as the Himalayas. Both ranges are still actively growing because they were formed by tectonic plate collisions that have not stopped.

If someone asks you "what is the longest and highest mountain range in the world," the most accurate answer is: the Himalayas are highest, the Andes are longest, and the Mid-Atlantic Ridge is technically the longest of all if you include the seafloor.

Top 10 Longest Mountain Ranges in the World

The top 10 longest mountain ranges in the world span six continents and include both above-water and underwater ranges. Here is the complete list:

The Himalayas — the highest mountain range in the world — are only the 10th longest. This is the geographic truth most people do not expect. The Himalayan range is concentrated and dramatic but relatively short compared to the long, sprawling Andes and Rockies.

Top 10 Highest Mountain Ranges in the World

The top 10 highest mountain ranges in the world contain the planet's tallest peaks. The Himalayan range dominates this list. Here is the breakdown by maximum altitude:

The Himalayas, Karakoram, Hindu Kush, Pamirs, and Tian Shan all sit in Central Asia and were all formed by the same Indian-Eurasian plate collision. This region — called the "Greater Himalaya" by geologists — contains every mountain above 7,000 m on earth.

What Is the 2nd Highest Mountain Range in the World?

The 2nd highest mountain range in the world is the Karakoram, located on the Pakistan-China border. The Karakoram's highest peak is K2 at 8,611 m — the world's second highest mountain after Everest.

What makes the Karakoram different from the Himalayas:

• Length: Approximately 500 km — much shorter than the Himalayas
• Highest peak: K2 at 8,611 m
• Four 8,000 m peaks total: K2, Gasherbrum I, Broad Peak, Gasherbrum II
• Location: Spans Pakistan, China, and India
• Climbing reputation: K2 is considered more technical and dangerous than Everest

The Karakoram is often confused with the Himalayas because they are next to each other and share similar climbing culture. Geologically and politically they are separate ranges. Many of the world's most extreme climbers prefer K2 over Everest because it requires technical skill, not just altitude tolerance.

What Is the 2nd Longest Mountain Range in the World?

The 2nd longest mountain range above sea level in the world is the Rocky Mountains, stretching approximately 4,800 km across North America. The Rockies cross Canada and the United States from British Columbia to New Mexico.

If you include underwater mountain ranges, the rankings shift:

• 1st longest overall: Mid-Atlantic Ridge (40,389 km, underwater)
• 2nd longest overall: Andes (7,000 km, above water)
• 3rd longest overall: Rocky Mountains (4,800 km, above water)

Most people use "longest mountain range" to mean above-water ranges visible on a map. By that standard, the 2nd longest mountain range is the Rocky Mountains. The Rockies are also significantly older than the Himalayas — formed approximately 80 million years ago compared to the Himalayas at 50 million years.

The Andes — World's Longest Above-Water Mountain Range

The Andes Mountains are the longest mountain range above sea level in the world, stretching 7,000 km along the western edge of South America. The range crosses seven countries — Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina — making it one of the most internationally shared mountain ranges on earth.

Key facts about the Andes:

• Length: 7,000 km (4,300 miles)
• Average width: 200 km
• Highest peak: Aconcagua at 6,961 m (Argentina)
• Average altitude: 4,000 m
• Countries crossed: 7
• Formation: Approximately 50 million years ago by the subduction of the Nazca Plate beneath the South American Plate
• Still growing: Yes, by approximately 1-2 cm per year

The Andes are unusual among mountain ranges because they are continuously connected from north to south — you can theoretically walk the entire 7,000 km along the spine of the range. Few have done it. The complete Andes traverse remains one of the great unfinished trekking goals in the world.

The Andes also host some of the world's most iconic high-altitude destinations: Machu Picchu in Peru, Salar de Uyuni in Bolivia, Patagonia in Chile and Argentina, and the Atacama Desert at high altitude. The range's biodiversity is staggering — from tropical Amazonian foothills to glaciated peaks within the same country.

Despite the length, the Andes do not match the Himalayas for sheer altitude. Only one Andean peak (Aconcagua) exceeds 6,900 m, while the Himalayas contain 9 peaks above 8,000 m.

The Himalayas — World's Highest Mountain Range

The Himalayas are the highest mountain range in the world. The range contains 9 of the 10 tallest mountains on earth and includes every peak above 8,000 m except K2 (which sits in the neighboring Karakoram range).

Key facts about the Himalayas:

• Length: Approximately 2,400 km
• Width: 250-400 km
• Highest peak: Mount Everest at 8,848.86 m (Nepal/Tibet)
• Peaks above 8,000 m: 10 (9 in the Himalayas, 1 in adjacent Karakoram)
• Peaks above 7,000 m: Over 100
• Countries crossed: 5 — Nepal, India, Tibet (China), Bhutan, Pakistan
• Formation: Approximately 50 million years ago by the collision of the Indian and Eurasian tectonic plates
• Still growing: Yes, by approximately 5 mm per year

The Himalayas matter geographically because they create the climate of South Asia. The range blocks monsoon winds, defines river systems (Ganges, Indus, Brahmaputra, Mekong, Yangtze, Yellow), and creates the highest plateau on earth (the Tibetan Plateau) just north of the range.

Nepal alone contains 8 of the 14 mountains above 8,000 m on earth:

• Everest (8,848.86 m)
• Kangchenjunga (8,586 m) — shared with India
• Lhotse (8,516 m)
• Makalu (8,485 m)
• Cho Oyu (8,188 m) — shared with Tibet
• Dhaulagiri (8,167 m)
• Manaslu (8,163 m)
• Annapurna I (8,091 m)

This concentration of extreme altitude in a single country is unmatched anywhere on earth. Pakistan and China share the remaining 8,000 m peaks (K2, Nanga Parbat, Gasherbrum I, Broad Peak, Gasherbrum II, Shishapangma).

After 10+ years guiding the Himalayas, Majestic Trails Nepal can confirm what every trekker discovers within their first week — the Himalayas do not behave like other mountain ranges. The scale is incomprehensible until you stand inside it. The first time a trekker reaches Poon Hill (3,210 m) and sees Dhaulagiri, Annapurna South, and Machhapuchhre rising 5,000 m higher than where they stand, the relationship to mountains changes permanently.

The Mid-Atlantic Ridge — Earth's Truly Longest Mountain Range

The Mid-Atlantic Ridge is the longest mountain range on earth — 40,389 km long, stretching from the Arctic Ocean to the southern tip of Africa. Most people do not know it exists because it is almost entirely underwater.

Key facts about the Mid-Atlantic Ridge:

• Total length: 40,389 km — more than five times longer than the Andes
• Width: 1,000-1,500 km
• Highest point above sea level: Iceland (the only large landmass on the ridge)
• Formation: Active tectonic spreading — the North American and Eurasian plates separate by 2.5 cm per year here
• Discovery: Mapped systematically only since the 1950s using sonar

The Mid-Atlantic Ridge runs down the center of the Atlantic Ocean from north to south. Iceland is the most famous place where the ridge breaks the ocean surface. The Azores, Ascension Island, Tristan da Cunha, and Bouvet Island are other parts of the ridge that surface as islands.

If you count underwater terrain, the Mid-Atlantic Ridge is unambiguously the longest mountain range on earth. If you only count above-water ranges visible on a map, the Andes win. Most search engines and reference sources accept the Andes as the answer because most people think of mountain ranges as land-based.

Geologically, the Mid-Atlantic Ridge is also the most active mountain range on earth. New rock forms there continuously as the plates separate.

Which Mountain Range Has the Largest Area?

The Himalayan-Karakoram-Hindu Kush system has the largest mountainous area of any range on earth — approximately 4.3 million square kilometers when you include all connected sub-ranges. The Andes, despite being longer, are narrower and cover approximately 3.4 million square kilometers in total area.

By single-range area calculations:

• The Andes: 3,371,000 sq km — longest individual range
• The Himalayas: Approximately 600,000 sq km — concentrated and high
• The Rockies: Approximately 1,200,000 sq km
• The Greater Himalayan System (Himalayas + Karakoram + Hindu Kush + Pamirs + Tian Shan): 4,300,000 sq km — the world's largest mountainous region

This is why searches for "longest and highest mountain range in the world by area" return slightly different answers depending on the source. The Andes are longest as a single range. The Greater Himalayan System covers the largest total area as a connected mountainous region.

Top 10 Highest Mountains in the World

The top 10 highest mountains in the world all sit above 8,000 m and all lie within the Himalayan or Karakoram ranges in Asia. Here is the complete list:

The 6th highest mountain in the world is Cho Oyu at 8,188 m, located on the Nepal-Tibet border. Cho Oyu is generally considered the easiest 8,000 m peak to climb. Many climbers attempting their first 8,000 m peak choose Cho Oyu as preparation for Everest.

The 7 highest mountains in the world are Everest, K2, Kangchenjunga, Lhotse, Makalu, Cho Oyu, and Dhaulagiri I — all above 8,160 m.

8 of the 10 highest mountains in the world lie wholly or partially in Nepal. This is why Nepal is considered the world's premier mountain trekking destination.

Which Peak Is Called the Killer Mountain?

Nanga Parbat is called the Killer Mountain. It is the world's 9th highest mountain at 8,126 m, located in the Western Himalayas in Pakistan. Nanga Parbat earned this nickname because of its extremely high fatality rate during early climbing attempts and its still-significant climbing dangers.

Why Nanga Parbat is called the Killer Mountain:

• 31 climbers died trying to climb Nanga Parbat between 1895 and 1953 before the first successful ascent
• The mountain has a fatality rate of approximately 5% across all climbing attempts
• The Rupal Face — the south face of Nanga Parbat — is the largest mountain face on earth at 4,600 m from base to summit
• Avalanche risk is among the highest of any 8,000 m peak
• The mountain stands isolated, unlike Everest which has supporting peaks — weather hits it directly from all sides

Other contenders for the "deadliest mountain" title:

• K2 is sometimes called the "Savage Mountain." Climbing fatality rate around 23-25% of summit attempts. Considered more technically difficult than Everest.
• Annapurna I has the highest summit fatality rate of any 8,000 m peak — approximately 32%. Located in Nepal, this is the same mountain whose base camp the ABC trek visits.

Critical distinction — climbing vs trekking:

These deadly statistics apply only to mountaineering expeditions attempting to summit the peaks. Trekking to base camp is completely safe. Annapurna I summit attempts have a 32% fatality rate, but the Annapurna Base Camp Trek to 4,130 m has recorded zero serious altitude sickness incidents in 10+ years of Majestic Trails Nepal guiding.

When you hear "Annapurna is the deadliest mountain in the world," that refers to climbers attempting the 8,091 m summit — not the trekkers reaching base camp far below. The two activities share the name but nothing else.

Andes vs Himalayas — Quick Comparison Table

For travelers and trekkers deciding which mountain range to visit, here is the honest side-by-side comparison:

Both ranges deliver world-class trekking and cultural experiences. The Andes win on length and biodiversity. The Himalayas win on altitude and the sheer scale of high mountain visible from a single point.

How Were the Andes and Himalayas Formed?

Both the Andes and the Himalayas were formed by plate tectonics — but through completely different mechanisms that explain why each range has the characteristics it does today.

Himalayas — collision orogeny:

The Himalayas were formed when the Indian tectonic plate collided with the Eurasian plate approximately 50 million years ago. India is still moving north at approximately 5 cm per year. This collision continues, which is why the Himalayas are still growing — by approximately 5 mm per year vertically.

The collision crushes both plates together, forcing the rock upward. This is why the Himalayas are concentrated, dramatic, and extremely high — they have nowhere to spread.

Andes — subduction orogeny:

The Andes were formed when the Nazca Plate (oceanic) was pushed beneath the South American Plate (continental). This is a subduction zone — the oceanic plate slides under the continental plate, melts in the mantle, and creates volcanoes that build up over millions of years.

This is why the Andes are long and contain volcanoes (Cotopaxi, Chimborazo) while the Himalayas are short and have no active volcanism. The Andes also still grow but more slowly than the Himalayas — about 1-2 cm per year.

The Mid-Atlantic Ridge — divergent boundary:

Unlike the Andes and Himalayas which were built by plates pushing together, the Mid-Atlantic Ridge is built by plates pulling apart. New rock erupts from the mantle continuously where the North American and Eurasian plates separate at 2.5 cm per year.

Three different tectonic mechanisms. Three different mountain ranges. All still actively forming today.

Which Mountain Range Can You Actually Trek?

The Himalayas are the world's premier mountain trekking destination. The Andes are second — phenomenal in their own way but harder to access for serious high-altitude trekking. Below is the honest comparison for travelers deciding where to trek.

Himalayan trekking — strengths:

• 8 of the 14 highest mountains on earth in Nepal alone
• Established teahouse infrastructure throughout
• No camping equipment required on most major routes
• Affordable compared to Andean equivalents
• Permits and guides easy to arrange
• Best months: October-November and March-April
• Major routes: Everest Base Camp, Annapurna Base Camp, Annapurna Circuit, Manaslu Circuit, Langtang Valley, Three Passes

Andean trekking — strengths:

• Inca Trail and Machu Picchu — globally iconic
• Patagonia's W Trek and O Trek in Torres del Paine
• Cordillera Blanca in Peru — high-altitude scenery
• Cordillera Huayhuash in Peru — remote and demanding
• Diverse climates from tropical to glaciated within the same trek
• Best months: November-March (Southern Hemisphere summer)

Why Himalayan trekking is more developed:

Nepal has built one of the most sophisticated trekking infrastructures on earth. Teahouses, licensed guides, established permits, helicopter rescue, and decades of experience handling international trekkers. The Andes are more fragmented across seven countries with varying levels of trekking infrastructure. Peru and Argentina are excellent. Other Andean countries are still developing.

For first-time international trekkers, the Himalayas in Nepal offer the strongest combination of altitude, scenery, infrastructure, cost, and accessibility.

The Himalayas in Nepal — Trekking the World's Highest Mountain Range

Nepal contains 8 of the 14 mountains above 8,000 m on earth. This is the highest concentration of extreme altitude in any country, anywhere. If you want to trek the world's highest mountain range, Nepal is where you go.

Majestic Trails Nepal trek options in the Himalayas:

• Everest Base Camp Trek — the iconic Himalayan experience
  14 days reaching 5,545 m at Kala Patthar with views of Everest, Lhotse, and Nuptse. Cultural immersion through Namche Bazaar and Tengboche Monastery. From USD 1,500.
• Annapurna Base Camp Trek — the accessible base camp
  14 days reaching 4,130 m at the base of Annapurna South. The most beginner-friendly high-altitude trek in Nepal. Zero serious altitude sickness cases in 10+ years of guiding. From USD 940.
• Annapurna Circuit Trek — the landscape diversity trek
  14-21 days crossing Thorong La Pass at 5,416 m through 7 ecological zones. Hindu villages to Tibetan Buddhist Mustang. Maximum landscape variety on any Nepal trek.
• Manaslu Circuit Trek — the 8th highest mountain circumnavigation
  15 days circling Manaslu (8,163 m) — the world's 8th highest mountain. Restricted area permit required. Now trending in 2026.
• Three Passes Trek — the experienced trekker challenge
  22 days crossing Kongma La (5,535 m), Cho La (5,420 m), and Renjo La (5,360 m) while also reaching Everest Base Camp. Nepal's most demanding standard trek.

The Himalayas in Nepal offer the rare combination of extreme altitude AND accessibility. You can stand below Everest or Annapurna I within 14 days of arriving in Kathmandu — at a cost that the Andes simply cannot match.

→ View our Best Treks in Nepal — complete operator guide
→ View our 14-day Everest Base Camp Trek package

Frequently Asked Questions

1. Which is the highest and longest mountain range in the world?

The highest mountain range in the world is the Himalayas with Mount Everest at 8,848.86 m. The longest mountain range above sea level is the Andes at 7,000 km along South America. These are two different mountain ranges. The Mid-Atlantic Ridge is technically the longest of all at 40,389 km but is mostly underwater.

2. What is the 2nd highest mountain range in the world?

The 2nd highest mountain range in the world is the Karakoram, located on the Pakistan-China border. The Karakoram contains K2 (8,611 m) — the world's second highest mountain — plus three other peaks above 8,000 m: Gasherbrum I, Broad Peak, and Gasherbrum II.

3. What is the 2nd longest mountain range in the world?

The 2nd longest mountain range above sea level is the Rocky Mountains at 4,800 km across North America from Canada to New Mexico. If you include underwater ranges, the 2nd longest is the Andes at 7,000 km — with the Mid-Atlantic Ridge in first place at 40,389 km.

4. What are the top 10 mountain ranges in the world?

The top 10 longest mountain ranges by length are: Mid-Atlantic Ridge, Andes, Rocky Mountains, Great Dividing Range, Transantarctic Mountains, Kunlun Mountains, Ural Mountains, Atlas Mountains, Appalachian Mountains, and Himalayas. By altitude the top 10 are: Himalayas, Karakoram, Hindu Kush, Pamirs, Tian Shan, Andes, Alaska Range, Caucasus, Atlas, and Alps.

5. Which peak is called the Killer Mountain?

Nanga Parbat is called the Killer Mountain. Located in the Western Himalayas in Pakistan at 8,126 m, the mountain killed 31 climbers between 1895 and 1953 before the first successful ascent. K2 is called the "Savage Mountain" and Annapurna I has the highest fatality rate of any 8,000 m peak at approximately 32%.

6. What is the 6th highest mountain in the world?

The 6th highest mountain in the world is Cho Oyu at 8,188 m, located on the Nepal-Tibet border. Cho Oyu is widely considered the easiest 8,000 m peak to climb and is often chosen by climbers attempting their first 8,000 m summit.

7. Which is the longest mountain in the world?

The longest single mountain is Mauna Loa in Hawaii at 5,271 m above the ocean floor and 4,170 m above sea level. Measured from the seafloor, Mauna Loa is taller than Mount Everest. As a mountain range, the Andes are longest above water at 7,000 km.

8. Can you trek the Himalayas?

Yes, the Himalayas are the world's most developed trekking destination. Nepal offers established routes including Everest Base Camp (14 days), Annapurna Base Camp (14 days), Annapurna Circuit (14-21 days), and Manaslu Circuit (15 days). All major routes have teahouse accommodation, licensed guides, and required permits available year-round.

9. How tall are the Himalayas compared to the Andes?

The Himalayas are taller than the Andes by approximately 1,888 m at their highest peaks. Mount Everest in the Himalayas reaches 8,858.86 m. Aconcagua in the Andes — the highest Andean peak — reaches only 6,961 m. The Himalayas contain 9 peaks above 8,000 m. The Andes contain zero peaks above 7,000 m.

10. Where do the Himalayas end?

The Himalayan range extends across five countries — Pakistan, India, Nepal, China (Tibet), and Bhutan — over a length of approximately 2,400 km. The western end is the Nanga Parbat area in Pakistan. The eastern end is Namcha Barwa in Tibet near the Burmese border. The range is bordered by the Karakoram to the northwest and the Hindu Kush further west.

Conclusion — The Roof and Spine of the World

The longest and highest mountain range in the world is two different mountain ranges. The Andes are longest at 7,000 km. The Himalayas are highest with 9 of the 10 tallest peaks on earth. The Mid-Atlantic Ridge is technically the longest of all but lies underwater. The Karakoram is second highest. The Rocky Mountains are second longest above sea level. The Killer Mountain is Nanga Parbat in the Western Himalayas.

These are the geographic facts. The more interesting truth is what they mean for travelers.

The Andes are wild and long. You can spend a lifetime exploring them. The Himalayas are short by comparison but stand higher than anything else on earth — and they are accessible to ordinary trekkers in ways that no other mountain range in the world is. You can fly into Kathmandu on a Monday and stand at the base of the world's tallest mountain 12 days later. No other 8,000 m mountain on earth offers this.

At Majestic Trails Nepal, we have spent 10+ years guiding trekkers through the highest mountain range in the world. We have watched first-time visitors stop dead on the trail when they realize what they are looking at. We have watched returning trekkers come back five and six times because the Himalayas pull on something the rest of the world does not. We have watched a 70-year-old reach Everest Base Camp because the right preparation matters more than age in this range.

The longest mountain range in the world is the Andes. The highest is the Himalayas. The only one you can stand inside this year — and feel small in a way nothing else can make you feel — is the Himalayas.

→ View our 14-day Everest Base Camp Trek — stand at the base of the world's highest mountain
→ View our 14-day Annapurna Base Camp Trek — the most accessible Himalayan base camp experience
→ Read our Top 10 Best Treks in Nepal — complete operator guide for 2026
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