Coastal zones occupy a unique position in the global geography of displacement. They are simultaneously places of abundance and peril: rich in marine resources, trade routes, and fertile land, yet acutely vulnerable to rising seas, storm surges, and land subsidence. For millions of people forced to flee their homes due to environmental change, conflict, or economic hardship, coastlines often represent the nearest available refuge. However, the same dynamics that make these areas attractive also generate new risks of secondary displacement. Understanding how environmental and human geography intersect in coastal zones is essential for designing policies that protect both displaced populations and the ecosystems they depend on.

The Dual Role of Coastal Zones: Refuge and Risk

Coastal regions have historically been magnets for human settlement. Nearly 40 percent of the global population lives within 100 kilometers of the coast, and many of the world’s largest cities are coastal. This concentration creates both opportunities and vulnerabilities for displaced people. On one hand, coastal economies offer employment in fishing, tourism, port logistics, and informal trade—sectors that can absorb labor from displaced groups. On the other hand, coastal areas are increasingly threatened by climate change impacts that directly undermine their habitability.

Environmental Drivers of Displacement

Sea-level rise is the most pervasive environmental driver of coastal displacement. The Intergovernmental Panel on Climate Change (IPCC) projects that global mean sea level could rise by up to 1 meter by 2100 under high-emission scenarios, threatening low-lying deltas and islands. Coastal erosion, saltwater intrusion into freshwater aquifers, and the increased frequency of extreme weather events such as tropical cyclones compound this pressure. In Bangladesh, for example, rising salinity in the Sundarbans delta has already forced thousands of farming families to abandon their land and move toward urban centers like Khulna and Dhaka. These movements are often internal and informal, placing strain on already overcrowded cities.

Ecosystem degradation further amplifies displacement risks. Mangrove forests, coral reefs, and seagrass beds act as natural buffers against storm surges and erosion. When these ecosystems are degraded—by pollution, overfishing, or coastal development—the protection they provide diminishes. For communities living in the shadow of degraded reefs, the likelihood of disaster-induced displacement rises sharply. A 2020 study published in Nature Communications found that mangrove loss correlated with a 20–30 percent increase in flood-related displacement in coastal areas of Southeast Asia.

Human Geography Factors

Human activities fundamentally alter coastal landscapes and shape displacement patterns. Rapid urbanization in coastal cities—often unplanned and lacking adequate infrastructure—creates informal settlements on floodplains, slopes, and reclaimed land. These settlements are home to a large share of displaced populations, who are drawn by perceived economic opportunity but end up living in some of the most hazard-prone zones. In Manila, nearly 4 million people live in informal communities along waterways and the shoreline; many are internal migrants fleeing poverty or conflict in other parts of the Philippines.

Tourism and industrialization also contribute to displacement by driving up land prices and converting traditional fishing or agricultural grounds into resorts, ports, or free-trade zones. In Kenya’s coastal region, the expansion of large-scale tourism resorts along the Indian Ocean has pushed small-scale fishers and farmers onto marginal land, increasing their exposure to coastal erosion and flooding. This process—sometimes called “climate gentrification”—displaces vulnerable populations not through direct environmental force but through economic pressures that reduce their access to safe land.

Case Studies: Coastal Displacement in Action

Examining specific contexts reveals how environmental and human geography interact to produce distinct displacement patterns.

Bangladesh: Migration from the Sundarbans

The Sundarbans delta, shared between India and Bangladesh, is one of the most climate-vulnerable regions in the world. Rising sea levels and increased storm intensity have caused repeated crop failures and destroyed freshwater supplies. A 2021 survey by the International Organization for Migration (IOM) found that 70 percent of households in the Bangladeshi Sundarbans had experienced at least one member migrating for work or shelter in the previous decade. Most moved to nearby cities, but a significant minority undertook long-distance migration to Dhaka or even to Middle Eastern countries as labor migrants. The departure of working-age adults has left behind communities composed mainly of the elderly, women, and children, creating a dependency burden on already strained social services.

Manila and Jakarta: Urban Coastal Displacement

Manila and Jakarta illustrate how rapid urbanization amplifies coastal displacement risks. Both cities are sinking due to groundwater extraction, while sea levels continue to rise. In Jakarta, parts of the city are subsiding by up to 25 centimeters per year, making large swaths uninhabitable. The Indonesian government’s plan to relocate the national capital to Borneo is, in part, a response to the severe flooding and subsidence threatening millions. Meanwhile, Manila’s informal settlements are repeatedly washed away by typhoons, only to be rebuilt in the same locations because alternative housing is unaffordable. Here, displacement is cyclical: families move, reconstruct, and are displaced again within a few years, a pattern that perpetuates poverty and environmental degradation.

Small Island Developing States (SIDS): Loss of Homeland

For SIDS such as Tuvalu, Kiribati, and the Maldives, coastal displacement is not a temporary phenomenon but a permanent loss of territory. Entire atolls are becoming uninhabitable due to saltwater intrusion and storm surges. The concept of “planned relocation” has emerged as a policy response, but it raises profound questions about identity, sovereignty, and cultural continuity. In Fiji, the government has identified over 800 communities at risk of forced relocation by 2050, and several villages—like Vunidogoloa—have already been moved inland. These cases highlight that displacement from coastal zones is not solely a matter of moving people; it involves moving entire ways of life.

Key Challenges to Sustainable Refuge

While coastal zones can offer refuge, several structural challenges undermine their capacity to host displaced populations sustainably.

Resource Scarcity and Conflict

Freshwater availability is a critical constraint. Many coastal aquifers are already affected by saltwater intrusion, and the arrival of displaced populations increases demand. In the Horn of Africa, competition over freshwater in coastal towns like Kismayo (Somalia) and Bossaso has led to tensions between host communities and internally displaced people (IDPs). Similarly, fisheries—a primary source of protein and livelihoods—are being depleted by industrial overfishing and climate-driven shifts in fish stocks. When displaced populations turn to fishing, they may inadvertently exacerbate resource stress unless collaborative management frameworks are in place.

Governance and Policy Gaps

Most national legal frameworks do not formally recognize “climate refugees” or provide a clear pathway for the relocation of coastal populations. The 1951 Refugee Convention does not cover environmental displacement, leaving millions in a legal gray area. Coastal zone management is often fragmented among multiple agencies—environment, disaster management, urban planning—with little coordination. In many developing countries, land tenure in informal settlements is insecure, making it difficult for displaced people to access public services or adaptation funding. Without secure rights, investment in resilient housing or infrastructure is unlikely to occur, perpetuating vulnerability.

Ecosystem Degradation Feedback Loops

Displacement can itself degrade the coastal ecosystems that provide protection. The concentration of large populations in coastal slums often leads to untreated sewage discharge, mangrove clearance for housing, and overexploitation of marine resources. This degradation reduces the natural buffer against storms, increasing the hazard for all residents—host and displaced alike. Breaking this feedback loop requires that displacement management be integrated with coastal conservation and restoration efforts.

Opportunities for Integrated Solutions

Despite these challenges, coastal zones offer unique opportunities to build resilience for displaced populations through integrated environmental and social strategies.

Ecosystem-Based Adaptation (EbA)

Restoring mangroves, coral reefs, and dunes not only protects coastlines from erosion and storm surges but also provides livelihoods and food security. In Vietnam, mangrove replanting combined with sustainable aquaculture has reduced the impacts of typhoons on coastal communities and created jobs for displaced households. EbA projects that explicitly include displaced people as participants—not just beneficiaries—can foster social integration and reduce pressure on social services. For example, in the Philippines, the “Mangrove for Livelihoods” initiative in Southern Leyte trains IDPs in mangrove nursery management and eco-tourism guiding.

Community-Led Planning and Participatory Governance

Top-down coastal management often fails to address the needs of the most vulnerable. Participatory approaches that include displaced populations, host communities, and local governments in joint planning can produce more equitable outcomes. In the Indian state of Odisha, the government’s “Integrated Coastal Zone Management Project” involves fishing communities and migrant workers in designing early warning systems and evacuation routes. This has reduced cyclone mortality significantly, even as the population of coastal settlements has increased due to migration.

Climate-Resilient Infrastructure and Early Warning Systems

Building or retrofitting coastal infrastructure—sea walls, elevated roads, flood-proof housing—can reduce displacement risks. However, infrastructure must be designed with input from displaced communities to ensure it meets their specific needs. In Bangladesh, the “Climate Resilient Infrastructure” program has constructed multipurpose cyclone shelters that also serve as schools and community centers, accommodating displaced families during emergencies. Early warning systems that deliver alerts via mobile phones and community radio have proven effective in enabling timely evacuation, but they must be maintained and tested regularly.

Policy Frameworks and International Cooperation

The global governance of coastal displacement remains fragmented, but progress is being made at multiple levels.

The Role of the UNFCCC and IOM

The United Nations Framework Convention on Climate Change (UNFCCC) has established the Warsaw International Mechanism for Loss and Damage, which recognizes displacement as a key concern. However, dedicated funding for coastal relocation programs is still minimal. The IOM has developed a set of “Migration, Environment and Climate Change” guidelines that encourage states to include migration in their National Adaptation Plans (NAPs). Several countries—including Fiji, Kenya, and Bangladesh—have begun to integrate displacement scenarios into their coastal zone policies, though implementation lags.

National Adaptation Plans and Local Implementation

At the national level, the most effective policies combine preventive adaptation (e.g., building codes, set-back lines for construction) with responsive measures (e.g., relocation assistance, livelihood diversification). Nepal’s Climate Change Policy includes provisions for mapping climate-induced migration, though it is a landlocked country; coastal nations like Vietnam have adopted similar approaches. Local implementation requires capacity building at municipal levels, where most decisions about land use and infrastructure are made. Donor agencies such as the World Bank and Green Climate Fund increasingly require that coastal projects include a displacement risk assessment.

Conclusion: A Call for Comprehensive Approaches

Coastal zones will remain both a magnet for displaced populations and a frontline of climate change impacts. Neither purely environmental nor purely social solutions will suffice. What is needed are integrated strategies that treat displaced people not as a problem to be managed but as stakeholders in resilient coastal communities. Restoring ecosystems, securing land tenure, investing in climate-resilient infrastructure, and strengthening participatory governance can transform coastal zones from zones of risk into genuine refuges. International cooperation, national policy innovation, and local empowerment must work in tandem to ensure that the coastal zones of tomorrow offer safety and opportunity—not just temporary shelter.