The Sea Is Moving In… Are Coastal Forests Running Out of Time?

If you walk along parts of coastal North Carolina or the Chesapeake Bay, the view can stop you in your tracks. Tall trees stand in shallow water, stripped of leaves. Their bark is pale. Their branches are bare. From a distance, it looks like a forest frozen in time.

These are known as ghost forests. They were once healthy coastal woodlands filled with birds, shade, and thick undergrowth. Now they are quiet stands of dead trees, slowly giving way to marsh grass.

For many people who live nearby, this change has not happened overnight. It has crept in year by year, tide by tide.


Saltwater is changing the soil beneath the trees

Coastal forests depend on freshwater in the soil. Trees such as loblolly pine, bald cypress, red maple, and Atlantic white cedar cannot survive in salty ground for long. When seawater pushes inland during high tides, storms, or gradual sea level rise, it seeps into the soil and groundwater.

Salt makes it difficult for tree roots to absorb water. Even when the soil looks wet, the trees begin to dry out from the inside. Leaves thin. Branches weaken. Growth slows. Over time, the trees die, often remaining upright for years. That is how the landscape takes on its ghostly appearance.

Researchers describe this process as a transition. A freshwater forest becomes stressed by saltwater intrusion. As trees die, salt-tolerant marsh plants move in and take their place.

Rising seas are accelerating the shift

Sea levels are rising as oceans warm and land ice melts. Even small increases in water level can mean more frequent flooding in low-lying coastal areas. What was once dry ground may now sit under brackish water several times a year.

Scientists studying coastal North Carolina have used long-term satellite imagery to track these changes. Research from North Carolina State University found that over just 13 years, tens of thousands of hectares of coastal forest shifted into ghost forest and marsh due to saltwater exposure.

Field measurements of soil salinity and groundwater show that repeated exposure to salt steadily weakens trees. Major storms can speed up the damage by pushing seawater far inland. Drought can make things worse by lowering freshwater levels, allowing salt to move deeper into the ground.

A 2023 study of southeastern United States wetlands found that seawater intrusion does more than kill trees. It changes soil chemistry, affects how nutrients move through the system, and reshapes plant productivity. What grows there next is not the same as what stood before.

The impact goes beyond the trees

At first glance, ghost forests may look like a strange natural sight. But they signal a deeper shift in the coastal environment.

Forests store large amounts of carbon in their wood and roots. When trees die and decompose, some of that carbon can return to the atmosphere. Marshes that replace forests can also store carbon, sometimes effectively, but the balance is different. Scientists are studying how this change affects long-term carbon storage and climate patterns.

Wildlife also feels the impact. Birds that depend on dense forest cover may lose nesting areas. Mammals that move through wooded corridors must adjust to more open marshland. At the same time, species that thrive in wetlands begin to expand.

For nearby communities, the shift is not only ecological. Forested wetlands help slow storm surge and reduce erosion. As root systems decay, shorelines may become more exposed. Saltwater intrusion can also reach farmland and freshwater supplies, affecting livelihoods.

A clear sign of a changing coastline

Researchers describe ghost forests as one of the most visible signs of climate-driven change along the coast. Unlike charts or data tables, these stands of dead trees are easy to see from the road or a boat.

Scientists continue to monitor affected regions using satellite data, aerial mapping, and field surveys. Their goal is to understand how quickly these forests are disappearing and which areas may be next.

For people living near the water, ghost forests are not just a scientific term. They are part of the landscape. They show how the boundary between land and sea is slowly shifting, reshaping familiar places in ways that are hard to ignore.