Government-supported surveys now estimate approximately 5,900–6,200 plant and animal species in the DMZ and nearby civilian-controlled areas, which include 101 species at risk, nearly 38% of South Korea’s listed threatened wildlife. This data makes the Korean demilitarized zone’s transformation into a wildlife sanctuary. It’s one of the world’s most noticeable cases of unplanned preservation.

Established under the Korean Armistice Agreement in 1953, the Korean Demilitarized Zone (DMZ) stretches approximately 250 km (155 miles) across the peninsula. It’s about 4 km wide, creating a buffer zone of roughly 419 km², and for over seven decades, strict military control has restricted agriculture, construction, and habitation. Because there hasn’t been ongoing human disturbance, ecosystems have recovered substantially.

From War Zone to Unexpected Safe Refuge

Before the Korean War, much of the DMZ’s western lowlands was farmed, and after 1953, landmines, fences, and patrols stopped construction. Forests regrew, wetlands revived, and riverbanks stabilized; scientists now call the DMZ an “ecological belt” that connects the eastern mountains with the western river mouths, sustaining forests, swamps, grasslands, and coastal areas along a continuous stretch.

Oddly enough, means of separation became obstacles against habitat loss. Thus, the Korean demilitarized zone became a wildlife sanctuary.

Also Read: The Long-Term Environmental Impacts Of Road Salt In Virginia

Biodiversity: What Lives in the DMZ

South Korea’s National Institute of Ecology has done assessments that give details about the DMZ’s variety:

• Total species noted: 5,929 (bugs, plants, birds, mammals, fish, amphibians, and reptiles)
• Wildlife at risk: 101 species, including 18 Class I (in critical danger) and 83 Class II (endangered/at risk)
• Birds: About 277 species, with sizable groups of red-crowned and white-naped cranes
• Mammals: 47 species, like the Asiatic black bear, Amur goral, leopard cat, and Eurasian otter
• Plants: Over 1,900 species, many doing well in close-to-original forests and wetlands.

This gathering is striking because the DMZ occupies only a small portion of the land, yet supports a high density of Korea’s wildlife.

Also Read: Biodiversity At A Crossroads: Species Gains And Losses In 2025

Why Cranes Are Important: A Key Stopover

The DMZ is on the East Asian–Australasian Flyway, one of the world’s bird migration routes that is most at risk. Seven of the world’s 15 crane types are known to use DMZ wetlands and nearby lands for wintering or breaks. Conservation groups estimate that approximately 10% of the world crane population winters in areas associated with the DMZ’s Civilian Control Zone, particularly the Cheorwon Plain.

Given that crane numbers indicate the health of wetlands, their persistence underscores the ecological resilience that enabled the Korean demilitarized zone’s transformation into a wildlife sanctuary.

Also Read: How Urban Biodiversity Projects Are Changing Cities For The Better

Large Mammals and Silent Returns

Camera traps and roundabout tracking have shown Asiatic black bears breeding, including cubs, which demonstrates a practical habitat rather than merely an occasional presence. Other mammals, such as Siberian musk deer and Amur goral, depend on steep, wooded ground that has been undisturbed for a long time. Some animals, such as the Amur leopard or the Siberian tiger, are sometimes reported but not yet confirmed, showing how hard it is to check mined, restricted ground.

Numbers vary slightly based on survey reach and area description.

Also Read: Biodiversity And Depopulation: Ecological Changes In Eastern Europe’s Shrinking Communities

Science Under Limits

A lot of the DMZ is off-limits, so researchers use remote sensing, environmental DNA (eDNA), and camera traps, and these methods have been used to find rare fish and mammals without disturbing habitats. Although access remains limited, long-term data collected since the 1970s provide sufficient information to track trends. The Korean demilitarized zone’s transformation into a wildlife sanctuary offers a natural setting for studying rewilding and how nature responds to climate change.

Also Read: Native American Environmental Leadership And Its Lasting Impact On U.S. Policy

The Peace Problem: Risks Ahead

If peace lasts, it could mean rail lines, roads, and tourist spots, which pose risks of habitat fragmentation and wetland loss if planning is weak. Ecologists warn that building without wildlife paths and solid zoning could easily undo progress made over 70 years. Many push for formal recognition, such as a UNESCO Biosphere Reserve, to ensure conservation is part of any forthcoming mending of relations.

Also Read: Community-Led Biodiversity Solutions That Are Making A Real Impact

Protecting Nature While Building Peace

The Korean demilitarized zone’s transformation into a wildlife sanctuary proves how backing off can heal the land. Because people haven’t been using the land as much, ecosystems could re-establish, species could recover, and wetlands could function again. As things move forward politically, the aim is simple: transform an unplanned sanctuary into a conservation legacy intentionally designed. With planning grounded in science, proper legal backing, and cross-border collaboration, the DMZ can remain a sign of hope where peace makes nature stronger.

Also Read: Nature’s Warning Signs: What Ecosystem Changes In 2025 Reveal

FAQs

1. How many species are there in the DMZ?

The range is estimated to be between 5,900 and 6,200 species currently.

2. Why is the DMZ important to species at risk?

Because the habitat has been stable for so long, 101 species at risk live there, close to 38% of South Korea’s total endangered species.

3. Could peace be a danger to the sanctuary?

Yes, if there are no safety measures in place. Experts say conservation zoning, pathways, and impact reviews are key to protecting wildlife if relationships change.

Also Read: Effective Biodiversity Conservation Strategies For Tropical Forests