A ghost forest is a stretch of dead or dying trees along a coastline where saltwater has moved inland and poisoned woodland that once thrived on fresh water. The name comes from their appearance: pale, leafless trunks standing upright in waterlogged ground, often surrounded by marsh grass that has already begun replacing the forest floor. These eerie landscapes are spreading along the eastern United States and other low-lying coasts worldwide, and they serve as one of the most visible markers of sea-level rise.
How Saltwater Kills a Forest
Coastal forests depend on fresh groundwater. As sea levels rise, saltwater pushes farther inland through the soil and into rivers and estuaries, gradually replacing that freshwater supply. Trees absorb the salty water through their roots, and most species have no way to filter it out. Salt disrupts a tree’s ability to take up water and nutrients, essentially dehydrating it even while its roots sit in wet ground. The process is slow. It can take years or even decades for a forest to fully die off, which is why ghost forests often contain trees at every stage, from healthy canopy to bare gray trunks.
Not all trees succumb at the same rate. Hardwood species like red maple and sweetgum are more susceptible and tend to die at lower salt concentrations, in the early stages of forest retreat. Evergreen species like loblolly pine and eastern redcedar are hardier, persisting at higher salinities and dying off later. This means a ghost forest in its early stages often looks like a pine stand surrounded by dead hardwoods, with the pines themselves declining over the following years.
Where Ghost Forests Are Spreading
Ghost forests now fringe all low-lying coastal areas of the eastern United States, from the palmetto thickets of the Gulf Coast to the white-cedar groves of New England. The mid-Atlantic region is especially hard hit. In Maryland, Delaware, and Virginia, rising seas are driving saltwater steadily inland. About 100 miles from Washington, D.C., near Taylor’s Island and Fishing Creek on Maryland’s Eastern Shore, hundreds of acres of dead trees stand upright in what was recently productive forest.
North Carolina’s Albemarle-Pamlico Peninsula, a low-lying stretch of land jutting into the Atlantic, has become one of the most studied ghost forest landscapes in the country. Researchers have documented more than 100 field sites there. A major five-year project funded by the National Science Foundation is now tracking the migration of marshlands into forests and farms across sites in Virginia, Delaware, Maryland, New York, and New Jersey. The pattern is consistent: wherever the land is flat and close to sea level, saltwater is creeping in and forests are retreating.
What Replaces the Trees
Ghost forests are not simply dead zones. They represent a transitional stage as one ecosystem transforms into another. As trees die and the canopy opens up, salt-tolerant marsh grasses colonize the forest floor. Over time, the landscape shifts from woodland to salt marsh, with the standing dead trunks (called snags) persisting for years as the only visible reminder that a forest once stood there.
This transition reshapes the animal communities as well. Research along the forest-to-marsh boundary has found that as the habitat shifts, forest-dwelling invertebrates like springtails retreat while salt marsh species move in. One well-studied marsh amphipod was found to occupy a larger dietary niche in the ghost forest zone than in established marsh, likely because it could feed on both terrestrial and marsh plant material. For some salt marsh species, ghost forests may actually provide an important opportunity: as older marshes erode from their seaward side due to rising water, newly formed marsh on the forest side gives these species room to maintain their habitat range.
The Climate Feedback Loop
Living coastal forests are effective carbon sinks, pulling carbon dioxide from the atmosphere and storing it in wood and soil. When those forests die, that stored carbon begins to break down. The waterlogged, oxygen-poor conditions in ghost forests also create environments where microbes can produce methane, a greenhouse gas roughly 28 to 36 times more potent than carbon dioxide over a century.
The picture is more complicated than “dead forest equals more greenhouse gas,” though. Standing dead trees in ghost forests host communities of bacteria that actually consume methane. In one study of snags across North Carolina’s ghost forests, methane-consuming microbes were present in every tree sampled, while methane-producing microbes appeared in only 20% of them. Some individual snags absorbed more methane than they released. The net effect of ghost forests on the atmosphere is still being measured, but the dead trees themselves appear to partially offset methane emissions rather than simply amplifying them.
What Can Be Done
There is no practical way to reverse ghost forest formation once saltwater has saturated the soil. Management strategies instead focus on slowing the process or guiding the transition. Shoreline stabilization, such as reinforcing eroding banks, can reduce how quickly saltwater advances. Restoring natural drainage patterns in marshes helps maintain the boundary between salt and fresh water. Some projects apply thin layers of sediment to raise marsh elevation, buying time before the next surge of saltwater reaches the tree line.
The most forward-looking approach is called upland migration: instead of trying to save the existing forest, land managers plan for salt marsh to replace it and focus on ensuring that forests farther inland have room to persist. This can mean removing barriers like roads or levees that would otherwise prevent the natural landward shift. It is a strategy built around the recognition that ghost forests are not an anomaly to be fixed but a visible symptom of a coastline in motion.