Largest Uninhabited Island

Devon Island, Canada's massive Arctic landmass, holds the title of Earth's largest uninhabited island at 55,247 km² — roughly the size of Croatia. You'd be surprised to learn it's a polar desert where temperatures plunge to −50°C and winters last most of the year. No roads, villages, or permanent residents exist there. Scientists actually use its barren, crater-marked terrain to simulate Mars missions. Stick around, and you'll uncover what makes this frozen wilderness one of Earth's most extraordinary places.

Key Takeaways

• Devon Island in Canada's Nunavut territory is Earth's largest uninhabited island, covering 55,247 km²—comparable in size to Croatia or Ireland.
• Despite its vast size, Devon Island has zero permanent residents, no roads, ports, or villages, and all supplies must be flown in.
• The island experiences brutal polar desert conditions, with temperatures dropping to −50°C and summers lasting only 45–50 days.
• NASA uses Devon Island's Haughton Impact Crater as a Mars analog, conducting rover tests and habitat trials since 1999.
• The island's Inuit name, Tallurutit, means "Tattoos of the Chin," and while seasonal visits occurred, permanent settlement attempts always failed.

What Is the Largest Uninhabited Island on Earth?

Devon Island holds the title of Earth's largest uninhabited island, covering 55,247 km² (21,331 square miles) in Canada's High Arctic.

You might've heard polar myths suggesting remote Arctic islands support hidden communities, but Devon Island genuinely has zero permanent residents.

It ranks 27th among the world's largest islands overall, yet it outranks entire independent nations in size.

You'll find it larger than Cuba and nearly comparable to Ireland or Croatia.

Located in Nunavut's Qikiqtaaluk Region at 75°08′N 87°51′W, the island sits deep within Baffin Bay.

Visitor safety remains a serious concern here, as extreme cold, isolation, and unforgiving terrain define the landscape.

No roads, ports, villages, or permanent airstrips exist, making Devon Island one of Earth's most genuinely untouched and inaccessible places. Other notably large uninhabited islands include Axel Heiberg Island, also in Canada's Nunavut territory, covering approximately 43,178 km².

The island was first sighted by Europeans in 1616 when explorers Robert Bylot and William Baffin navigated through the region during their Arctic voyage.

The island's polar desert classification means it receives so little precipitation that it shares more in common with arid wastelands than the ice-covered landscapes many people imagine when picturing the Arctic.

How Big Is Devon Island Really?

Stretching 320 miles (515 km) long and 80–100 miles (130–160 km) wide, Devon Island covers 55,247 km² (21,331 square miles) of Canada's High Arctic. That surface area ranks it 27th largest worldwide and sixth largest in Canada — slightly bigger than Croatia and roughly the size of Ireland.

You might be surprised by how dramatically the terrain shifts across the island. Elevation climbs from 2,000 feet (600 m) in the west to 6,300 feet (1,920 m) in the east, where the Devon Ice Cap dominates.

The eastern third sits permanently buried under an ice cap, with ice thickness reaching 500–700 meters. Beneath that frozen mass lies ancient bedrock of Precambrian gneiss and Paleozoic siltstones, making Devon Island as geologically striking as it's vast. The island's southern coast is dramatically shaped by fjordlike inlets that cut deep into the landscape, evidence of powerful glacial forces at work.

To the north of Devon Island lies Ellesmere Island, one of the largest islands in the Canadian Arctic Archipelago, while Baffin Bay stretches out to the east. By comparison, Madagascar, situated roughly 400 kilometers off the coast of East Africa across the Mozambique Channel, is the fourth-largest island in the world, dwarfing Devon Island in overall size.

Why Does Nobody Live on Devon Island?

Given its sheer size, you might wonder why nobody calls Devon Island home — but the answer becomes clear fast.

The island's permafrost dynamics alone make construction nearly impossible, since thawing ground destroys buildings and Arctic winds prevent stable shelter.

Farming fails due to minimal topsoil, and fresh water barely exists in this polar desert that receives less precipitation than the Sahara. In fact, the only place on Earth drier than such polar deserts is Antarctica's McMurdo Dry Valleys, where no rain or snow has fallen for an estimated 2 million years.

Indigenous history tells a cautionary tale too.

Inuit families relocated to Dundas Harbour in 1934 abandoned the outpost within two years, defeated by brutal cold and wind.

Even earlier seasonal visits never became permanent stays.

Today, no roads, ports, or reliable airstrips exist, and every supply must be flown in at enormous cost — making permanent settlement economically impossible for anyone. The island was named Devon Island in 1819 by Matthew Liddon after Devon, England, though the Inuit had long known it by the name Tallurutit, meaning "Tattoos of the Chin."

Researchers do visit, however, drawn to the island's Haughton Impact Crater, whose harsh and barren terrain so closely mirrors Martian surface conditions that NASA uses the site to test equipment and strategies for future Mars missions.

The Brutal Climate That Makes Survival Nearly Impossible

Few places on Earth punish survival instincts like Devon Island's climate. With an average annual temperature of -16°C, you're facing winters that plunge to -50°C and summers barely reaching 8°C for just 45-50 days.

Permafrost challenges define every aspect of the terrain, keeping soil frozen almost year-round and preventing any reliable access to liquid water.

You'd also contend with extreme winds so relentless they forced the abandonment of a 1924 outpost at Dundas Harbour. The eastern third sits beneath an ice cap 500-700 meters thick, while the broader landscape offers little more than frost-shattered rocks and near-total absence of vegetation.

Devon Island doesn't just discourage survival — it actively works against it at every turn. Located within Baffin Bay in the Canadian Arctic Archipelago, it holds the distinction of being the largest uninhabited island on Earth. Its polar desert ecology, driven by high elevation and extreme northern latitude, strips the land of the vegetation and biodiversity most living things depend on to survive.

Why Astronauts Train on Devon Island's Barren Surface

Devon Island's Haughton Impact Crater — 20 kilometers wide and carved 23 million years ago — looks strikingly like the surface of Mars. Its polar desert environment, barren rocky terrain, and underground ice make it one of Earth's best Mars analogs.

Since 1999, NASA's Haughton-Mars Project has used the crater for field simulations, testing rovers, habitat designs, and mission equipment under temperatures that drop below -18°C. You'd find researchers conducting surveys in near-total isolation, practicing geological protocols on frost-covered rubble that mirrors ancient Martian surfaces.

Scientists also study microorganisms surviving extreme UV radiation inside rocks, informing Mars life-detection strategies. The Arthur Clarke Mars Greenhouse even tests plant growth in sterile soil here, directly supporting future human missions to the Red Planet. Sitting at 75°22′N, 89°41′W, Haughton Crater holds the distinction of being the highest-latitude terrestrial impact crater known on land.

These simulations also place a strong emphasis on human factors, helping researchers understand how prolonged confinement and extreme isolation affect performance and psychological resilience before actual deployment.

How Devon Island Ranks Against Other Large Uninhabited Islands

At 55,247 km², Devon Island isn't just large — it's the largest uninhabited island on Earth, outranking populated landmasses like Cuba and nearly matching Ireland in size. Its geological formations and sparse Arctic biodiversity make its ranking even more remarkable.

Here's how Devon stacks up:

• 27th largest island globally, surpassing many independent nations
• Larger than Cuba, which supports millions of residents
• Nearly Ireland's size, yet holds zero permanent population
• Second-largest in the Queen Elizabeth Islands, behind Ellesmere
• Sixth-largest island in Canada, outranking several inhabited counterparts

What separates Devon isn't just size — it's the combination of extreme isolation, polar desert conditions, and failed settlement attempts that keep it empty while comparable landmasses thrive with human communities.