Natural features are physical components of the Earth’s surface and environment that exist without human construction or design. They include landforms like mountains, valleys, and caves; bodies of water such as rivers, lakes, and oceans; coastal formations like barrier islands and coral reefs; and living systems including forests, wetlands, and biological soil crusts. The term spans everything from continent-sized mountain ranges to microscopic communities of organisms clinging to desert sand. What unites them is origin: natural features are shaped by geological, hydrological, atmospheric, and biological processes rather than by human engineering, though the boundary between “natural” and “modified” is not always clean.
Geological Landforms
The most familiar natural features are geological landforms: mountains, hills, plateaus, plains, canyons, and valleys. These are shaped over vast timescales by forces like tectonic plate movement, volcanic activity, erosion, and sediment deposition. A mountain range pushed up by colliding plates, a canyon carved by a river over millions of years, or a plain left behind by retreating glaciers are all geological natural features formed without any human intervention.
Some geological features arise from more specialized processes. Karst landscapes, for instance, form when surface and underground water dissolves soluble bedrock like limestone. The classic results include sinkholes, caves, sinking streams, and enclosed depressions. Mechanical erosion plays a secondary role; it is really the chemistry of water dissolving rock that creates the dramatic topography found in places like the limestone regions of southern China or the cave systems of Kentucky.1Watershed Ecology and the Environment. Karst topography: Formation, processes, characteristics, landforms, degradation and restoration: A systematic review
Glaciers produce their own distinctive set of landforms. As ice sheets advance and retreat, they scrape, push, and deposit sediment in recognizable patterns. Grounding-zone wedges, for example, are constructional features that build up at the grounded margins of glaciers that terminate in the sea. They form from persistent sediment accumulation during pauses in ice retreat, and their presence in the geological record helps scientists reconstruct how glaciers behaved thousands of years ago.2PubMed Central. The Holocene retreat dynamics and stability of Petermann Glacier in northwest Greenland Moraines, drumlins, and U-shaped valleys are other well-known glacial landforms that reshape entire regions.
Water Features
Rivers, streams, lakes, ponds, springs, and aquifers are among the most ecologically and economically important natural features on the planet. Hydrologists often divide these into two broad types based on whether the water is flowing or standing still. Flowing bodies like rivers and streams are called lotic systems, while standing or slow-moving bodies like lakes and reservoirs are lentic systems. The functions of each type individually are well studied, but researchers have noted that their collective interactions along a river corridor are less understood and deserve more attention.3Frontiers in Water. The River Corridor’s Evolving Connectivity of Lotic and Lentic Waters
This matters because water features do not exist in isolation. A river feeds a lake, which supports a wetland, which recharges groundwater. A spring emerges from an aquifer and becomes a stream. The entire network of connected water features within a landscape functions as a system, and disrupting one part can cascade through the rest. When people think of natural features, they tend to picture individual landmarks. But the connections between water features are just as “natural” and just as important as the features themselves.
Coastal and Marine Features
Coastlines are among the most dynamic natural environments on Earth, constantly reshaped by waves, tides, storms, and changes in sea level. Barrier islands are a good example of how complex the formation of a coastal natural feature can be. They begin when shallow platform areas develop in nearshore waters and subtidal shoals form on top of them. If those shoals are shielded from the most intense wave action, gentler waves transport sand over them and build them up to the intertidal zone. The newborn island is stabilized by widening berms, the emergence of new sandbars on its seaward side, and sand carried over by overwash during storms. Spit growth along the island’s length can also be critical to its early survival.4Marine Geology. Barrier Island formation through nearshore aggradation — Stratigraphic and field evidence
Despite that complicated construction process, barrier islands are fragile. Rising sea levels and changing storm patterns pose existential threats to them. One study of Cape Lookout National Seashore in North Carolina projected that with half a meter of sea-level rise, close to half of the barrier island’s above-water area would be flooded daily, and a storm with a one-year return period would flood roughly three-quarters of it. Projected shoreline retreat could average around 178 meters with one meter of sea-level rise, which would consume over 60% of the island’s width at its narrower points.5PubMed Central. The projected exposure and response of a natural barrier island system to climate-driven coastal hazards These are not obscure geological curiosities; barrier islands protect mainland coastlines, and their loss has real consequences for people who live behind them.
Out at sea, natural features take forms most people never see. Seamounts are underwater mountains formed by volcanic activity. Submarine canyons cut into the continental shelf much like river canyons cut into land. Cold seeps and hydrothermal vents are spots on the ocean floor where chemicals or superheated water emerge from beneath the Earth’s crust. These deep-sea features often host biogenic structures, living formations built by organisms that in turn support entire ecosystems.6Biological Conservation. Challenges for the conservation of marine small natural features A hydrothermal vent community thriving in total darkness, fueled by chemical energy rather than sunlight, is as much a natural feature as a mountain meadow.
Living Natural Features
Not all natural features are made of rock and water. Forests, grasslands, wetlands, and even soil communities qualify as natural features in their own right. A forest canopy, for instance, is a complex three-dimensional structure whose branches, foliage, and epiphytes intercept and regulate how rain, light, and nutrients reach the forest floor.7Forest Science. Old-Growth Forest Canopy Structure and Its Relationship to Throughfall Interception The canopy is not just a byproduct of trees growing; it is a structural feature that shapes the environment beneath it. In old-growth forests, the canopy becomes especially heterogeneous, with species composition and spatial distribution creating a three-dimensional architecture that varies dramatically across even a few hectares.8Forest Science. Three-Dimensional Canopy Structure of an Old-Growth Douglas-Fir Forest
At the other end of the size spectrum, biological soil crusts are communities of cyanobacteria, mosses, lichens, and fungi that colonize the surface of desert soils. They are easy to overlook but play an outsized role: these crusts roughen the soil surface, which slows water runoff and helps trap seeds and organic matter that would otherwise wash away.9Algological Studies. Biological soil crusts in deserts: A short review of their role in soil fertility, stabilization, and water relations Step on a biological soil crust and you might destroy decades of growth. These living features illustrate that “natural feature” does not have to mean something large or dramatic. Some of the most ecologically vital natural features are ones you could crush underfoot without noticing.
How Natural Features Protect People and Property
One of the strongest practical reasons to care about natural features is the protection they provide against hazards. Beaches, dunes, wetlands, barrier islands, and reefs have been recognized as natural infrastructure for flood risk management for over a century. International guidelines now explicitly treat these as part of coastal and riverine flood defense strategies, alongside traditional engineered structures like seawalls and levees.10Frontiers in Built Environment. Coastal Natural and Nature-Based Features: International Guidelines for Flood Risk Management
The protective value of these features is not abstract. Salt marshes, for example, have been shown to reduce both flood depth and property damage by up to about 14% during relatively moderate storm events. In concrete dollar terms, one study estimated that salt marshes in a set of coastal counties could prevent up to $13.1 million in residential property damage during a simulated 50-year storm under current sea levels, and up to $32.1 million during a scenario modeled on Hurricane Sandy with projected 2050 sea-level rise.11PubMed Central. Valuing natural habitats for enhancing coastal resilience: Wetlands reduce property damage from storm surge and sea level rise
Barrier islands and wetlands working together offer even more substantial protection. Research on Florida’s Apalachicola Bay system has quantified how barrier islands and marsh vegetation attenuate storm surge, finding that removing islands or vegetation dramatically increases surge heights reaching the mainland. The study developed methods to calculate a theoretical maximum attenuation rate for the landscape, providing a benchmark against which restoration efforts can be measured.12Frontiers in Ecology and Evolution. The potential of wetlands and barrier islands as a coastal defense in mitigating the storm surge The takeaway for coastal communities is straightforward: destroying natural features like barrier islands and wetlands does not just harm the environment in an abstract sense. It removes a physical buffer that reduces flooding and property loss.
How Natural Features Are Mapped
Identifying and classifying natural features used to rely heavily on field surveys and aerial photography, but the tools have changed dramatically over the past two decades. High-resolution topographic data collected by LiDAR, a technology that bounces laser pulses off the ground to create detailed elevation maps, has made it possible to detect features that would be invisible from traditional satellite imagery. Automated methods can now extract channel networks, identify channel heads, and distinguish natural geomorphic features from human-made structures like roads and bridges, even in flat, heavily engineered landscapes.13Water Resources Research. Automatic geomorphic feature extraction from lidar in flat and engineered landscapes
Machine learning has pushed this further. Researchers have applied algorithms trained on observed landform data to one-meter-resolution elevation models built from LiDAR to rapidly map and classify the various landforms of hilly terrain.14Applied Computing and Geosciences. Mapping landforms of a hilly landscape using machine learning and high-resolution LiDAR topographic data Where a geologist might spend weeks in the field classifying landforms across a study area, an algorithm trained on representative examples can process thousands of square kilometers in hours. This doesn’t replace expert judgment, but it makes large-scale inventories of natural features feasible in a way they were not before.
These mapping advances matter because you cannot protect or manage natural features you have not catalogued. Coastal planning, flood risk assessment, habitat conservation, and land-use regulation all depend on knowing where natural features are, what condition they are in, and how they are changing. Automated mapping tools make it possible to track those changes over time at scales that manual survey never could.
Where “Natural” Gets Blurry
The definition of a natural feature sounds simple until you start looking at specific cases. A river that has been dammed, channelized, and lined with concrete is clearly no longer a natural feature in the way an undisturbed stream is. But what about a river whose flow has been partially modified by upstream dams, yet still meanders through a floodplain it carved itself? Or a forest that was logged a century ago and has regrown into what looks like a mature woodland? Or a beach that has been nourished with trucked-in sand?
In practice, the boundary between natural and human-influenced is a spectrum rather than a line. International flood-management guidelines use the term “natural and nature-based features” to acknowledge this reality, grouping genuinely pristine features together with features that have been restored or maintained by human effort.10Frontiers in Built Environment. Coastal Natural and Nature-Based Features: International Guidelines for Flood Risk Management Beach nourishment, for example, is an engineering activity. But the resulting beach behaves like a natural feature: it absorbs wave energy, supports wildlife, and reshapes itself in response to tides and storms. The pragmatic approach treats “natural feature” as a functional category. If a landscape element performs natural functions through natural processes, it counts, even if humans helped it get there.
This is particularly relevant in places where centuries of agriculture, urbanization, and land management have reshaped nearly every surface. In Western Europe, for instance, almost no landscape is truly pristine. Semi-natural grasslands that look wild have been maintained by grazing for hundreds of years. The underlying geology is natural; the vegetation community exists in its current form because of human activity. These kinds of landscapes challenge the simple natural-versus-artificial divide and force planners to think about natural features in terms of function and process rather than origin alone.
Microclimate and Features You Cannot See
When people picture natural features, they tend to think of things they can stand on or look at: a mountain, a lake, a forest. But some of the most ecologically consequential natural features are invisible in the traditional sense. Microclimate is a good example. The temperature, humidity, wind speed, and vapor pressure deficit within a forest understory can be dramatically different from conditions just outside the tree line. These microclimatic conditions are shaped by the structural features of the ecosystem itself, from canopy density to topographic position, and they in turn influence how the ecosystem functions. Microclimatic responses to structural changes in ecosystems and landscapes have become a growing research focus, with vapor pressure deficit receiving particular attention for its role in driving plant water use and fire risk.15Agricultural and Forest Meteorology. The contributions of microclimatic information in advancing ecosystem science
Soil structure is another feature that hides in plain sight. The arrangement of particles, pore spaces, and organic layers within soil determines how water infiltrates, how roots grow, and how much carbon the ground can store. Soil does not photograph well from a satellite, but it is as much a natural feature as the mountain it blankets. The same goes for underground water systems. Aquifers, springs, and subsurface flow paths are all natural features that shape the landscape above them, even though they are entirely invisible from the surface.
Recognizing these less visible features matters because management decisions often ignore what they cannot see. A development project might assess impacts on visible features like streams and forests while overlooking the microclimate those features create or the subsurface hydrology they depend on. Losing the visible feature and the invisible one are not separate events; they happen together, and the ecological consequences of the invisible loss can be just as severe.
Small Natural Features and Why Size Misleads
There is a persistent tendency to equate “natural feature” with “large and impressive.” Grand Canyon, Niagara Falls, the Great Barrier Reef. These are natural features, obviously. But conservation science has increasingly recognized that small natural features often punch far above their weight ecologically. In the marine environment, small biogenic structures associated with seamounts, canyon walls, cold seeps, and hydrothermal vents support biodiversity that is disproportionate to their physical size.6Biological Conservation. Challenges for the conservation of marine small natural features A single hydrothermal vent field covering a few hundred square meters can harbor species found nowhere else on Earth.
On land, the pattern repeats. A small spring emerging from a hillside might support an entire downstream ecosystem during dry months. A single old-growth tree with its complex branch architecture and epiphyte communities can be a habitat feature as important to local biodiversity as the surrounding forest as a whole. Biological soil crusts in deserts, as mentioned earlier, can cover vast areas but each patch is thin and fragile, easily destroyed by a passing vehicle or herd of livestock.9Algological Studies. Biological soil crusts in deserts: A short review of their role in soil fertility, stabilization, and water relations
The challenge with small natural features is that they often fall below the resolution of mapping efforts and regulatory attention. Environmental impact assessments might flag the loss of a hectare of wetland but miss the destruction of a vernal pool or a rock outcrop that served as a critical roosting site. As mapping technology improves, with LiDAR resolutions now reaching one meter and algorithms capable of detecting subtle topographic features, the ability to identify and protect these small but important elements of the landscape is getting better. Whether the regulatory frameworks keep pace with the technology is a different question.