Earth’s continents are slowly but constantly on the move, and over the next 200 to 300 million years they will likely merge into a new supercontinent. The exact configuration is still debated, with at least four competing scientific models projecting very different arrangements depending on which ocean basins close first. Some of those changes are already visible today: Africa is in the early stages of splitting in two, and the Mediterranean Sea is gradually shrinking as Africa and Europe converge.
Changes Already Underway
The reshaping of continents is not some far-off abstraction. A 35-mile-long crack in Ethiopia’s Afar desert, which appeared in 2005, marked the acceleration of a process geologists had long suspected: the Somali tectonic plate is pulling away from the larger Nubian plate along the East African Rift System. If the process runs its course over the next five to ten million years, eastern Africa will fully separate, and a new ocean basin will flood the gap between the two landmasses.1Geodesy and Cartography. Investigation of the Africa splitting into two as new ocean forms The divergence involves both diffuse deformation across a broad zone and focused strain along narrow rift segments that bound rigid blocks of crust, making it more complicated than a simple clean break.2Geology. Redefining East African Rift System kinematics
Meanwhile, on the opposite side of the African plate, a different process is unfolding. The western Mediterranean is being squeezed shut as Africa pushes northward into Europe. Earthquake patterns and satellite positioning data trace what researchers describe as a nascent convergent boundary, suggesting that the tectonic processes currently at work are heading toward a progressive closure of western Mediterranean basins.3Earth and Planetary Science Letters. Retracing the Africa–Eurasia nascent convergent boundary in the western Mediterranean based on earthquake and GNSS data In geological terms, the Mediterranean is a remnant of the ancient Tethys Ocean, and its eventual disappearance would mirror what happened when earlier oceans closed during the assembly of past supercontinents.
The Supercontinent Cycle
Earth has assembled and broken apart supercontinents multiple times. Pangaea, the most familiar one, existed roughly 335 to 175 million years ago before rifting into the landmasses we recognize today. But Pangaea was not the first. Before it came Rodinia (about a billion years ago) and Columbia/Nuna (about 1.8 billion years ago), and there may have been even earlier ones. The pattern of ocean basins repeatedly opening and closing along old mountain belts is known as the Wilson Cycle, named after the geophysicist J. Tuzo Wilson, who first proposed it more than 50 years ago.4Geological Society, London, Special Publications. Fifty years of the Wilson Cycle concept in plate tectonics: an overview
This cycling is not random. The periodic assembly and breakup of supercontinents appears to be coupled with activity deep inside the planet, including pulses of mantle plumes that send hot rock rising toward the surface. Researchers have found a striking correspondence between the timing of large igneous province events, which are massive volcanic outpourings tied to mantle plumes, and the rhythm of supercontinent cycles.5Applied Sciences. How Could Supercontinent Cycle Modulate the Periodicity and Phase of Global Plume Heat Flux? That coupling means the next supercontinent is not just a surface-level prediction; it is woven into the planet’s thermal evolution.
Geologists studying the deep structure of northeastern North America have found that lithosphere northwest of certain geological boundaries still retains structural signatures from a supercontinent assembly that happened during the Neoproterozoic era, roughly 600 to 1,000 million years ago.6Geological Society, London, Special Publications. Crust of eastern North America preserves a record of the supercontinent cycle The rock beneath our feet, in other words, carries a record of these ancient mergers and splits, and that record is what helps scientists project the next one.
Four Scenarios for the Next Supercontinent
There is no single agreed-upon map for what the next supercontinent will look like. Instead, researchers have proposed four distinct scenarios, each named for the ocean basin whose closure would drive the assembly.7ScienceDirect. Back to the future: Testing different scenarios for the next supercontinent gathering
- Pangaea Ultima: The Atlantic Ocean reverses course and closes, essentially rewinding the breakup of Pangaea. The Americas swing back eastward to collide with Africa and Europe, creating a supercontinent that looks somewhat like an updated version of the original Pangaea.
- Novopangaea: The Pacific Ocean closes instead, as the Americas drift westward to merge with East Asia and Australia. This produces a landmass centered roughly where the Pacific is today.
- Amasia: The Arctic Ocean closes, pulling the Americas northward over the North Pole to meet Eurasia. This scenario leaves the Atlantic and Pacific partially open, at least initially.
- Aurica: Both the Atlantic and Pacific close, generating a supercontinent assembled from all directions and centered near the present-day equator.
Recent modeling work has added weight to the Amasia scenario by looking at how oceanic crust has changed over Earth’s history. As the planet slowly cools, oceanic crust becomes thinner and weaker, making it less likely that old, strong ocean floor can be forced shut by the kind of introversion process that assembled earlier supercontinents. The researchers behind this work argue that this secular cooling effectively rules out closing the younger Atlantic or Indian oceans and predicts that the next supercontinent will form through closure of the ancient Pacific basin instead.8Oxford Academic (National Science Review). Will Earth’s next supercontinent assemble through the closure of the Pacific Ocean? The distinction matters because the Pacific is already ringed by subduction zones, the geological machinery needed to consume ocean floor, making its closure mechanically plausible within roughly 200 to 300 million years.
That said, the uncertainty is real. The four scenarios are not minor tweaks on one another; they produce radically different geographies, and the timescales involved mean that small differences in the strength or speed of plate interactions could steer the outcome toward any of them. Researchers treat these models as testable hypotheses, not predictions carved in stone.
How Scientists Track Continental Movement Today
The claim that continents drift used to rest on indirect evidence: matching coastlines, fossil distributions, and paleomagnetic data frozen in ancient rocks. Today, satellite-based positioning systems measure continental movement directly, down to fractions of a millimeter per year. GPS networks across tectonically active regions record how fast different blocks of crust are shifting relative to one another.
In Azerbaijan, for example, a national GPS network tracked horizontal crustal movement during 2020–2021 and found an average velocity across the region of about 7.3 millimeters per year, with the surface generally moving in a north-to-northeast direction. On the Absheron Peninsula, the crust is being compressed and shortening at roughly 5 millimeters per year as the Arabian plate pushes into Eurasia.9Russian Journal of Seismology. Modern horizontal movements of tectonic blocks of the earth’s crust of Azerbaijan according to the data of the global positioning system (GPS) of the RSSC network In the Adriatic region, permanent satellite stations tracked tectonic motion through the seismic events near Durrës, Albania, in 2019. During quiet periods, horizontal movement rates were around 3 millimeters per year, but during the earthquake sequence the rates spiked dramatically before returning to baseline.10SGEM International Multidisciplinary Scientific GeoConference. MONITORING OF TECTONIC MOVEMENTS IN THE ADRIATIC REGION THROUGH NATIONAL PERMANENT SATELLITE NETWORKS
These numbers sound tiny, but they are relentless. A few centimeters per year compounded over millions of years adds up to thousands of kilometers of displacement. It is this steady, measurable drift that underpins all of the future continental projections. The GPS data also reveal that plates do not move as rigid sheets in a perfectly uniform direction. Different blocks within a single plate can move at different speeds and in slightly different directions, which is why predicting the exact layout 250 million years from now remains so challenging.
What Drives All of This
Rocky planets like Earth function as heat engines. Internal heat, left over from the planet’s formation and continuously generated by the decay of radioactive elements, drives convection currents in the mantle. That convection is what powers tectonic activity, crustal evolution, and even the generation of Earth’s magnetic field.11PubMed Central. Rocky Planets as Heat Engines But mantle convection alone does not fully explain why plates move at the speeds and in the directions they do.
Modeling work has shown that the dominant force pulling most plates is slab pull: the weight of cold, dense oceanic crust sinking into the mantle at subduction zones. Slabs effectively drag the rest of the plate behind them at rapid rates and can tear continents apart. Continents with thick, ancient roots, sometimes called keels, move more slowly when they are not attached to a subducting slab, which is why some landmasses drift faster than others.12PubMed Central. What drives tectonic plates? The picture that emerges is that the arrangement of plates at any moment shapes the forces acting on them, and those forces in turn reshape the arrangement, creating a feedback loop that makes long-term prediction inherently uncertain.
Climate on a Future Supercontinent
The arrangement of continents profoundly affects global climate, because it controls ocean circulation, the distribution of land at different latitudes, and how much sunlight different surfaces absorb. Researchers have modeled two possible configurations 200 and 250 million years from now: one in which a supercontinent sits at low latitudes near the equator, and another in which it forms at high northern latitudes with a separate landmass remaining near the south pole. The climate difference between these two scenarios is stark, with mean surface temperatures diverging by several degrees globally.13Geochemistry, Geophysics, Geosystems. The Climates of Earth’s Next Supercontinent: Effects of Tectonics, Rotation Rate, and Insolation
A low-latitude supercontinent would bake under direct sunlight, creating vast interior deserts far from any moderating ocean influence. A high-latitude supercontinent could support large ice sheets, potentially triggering another major glaciation. These projections also factor in that the Sun is gradually getting brighter over geological time, roughly one percent more luminous every hundred million years or so. By the time a future supercontinent assembles, the baseline solar energy hitting Earth will be measurably higher, compounding the heating effect of a tropical configuration or partially offsetting the cooling of a polar one.
Earth’s rotation rate also enters the picture. Tidal interactions with the Moon are slowly lengthening the day; 200 million years from now, days could be a couple of hours longer. A slower rotation alters atmospheric circulation patterns, which in turn affect where rainfall concentrates and where deserts expand. Climate modelers building these far-future scenarios have to account for all three variables: continental position, solar luminosity, and rotation rate. The result is a wide envelope of possible climates depending on which supercontinent scenario plays out.
How Continental Rearrangements Reshape Life
When continents collide, they create land bridges that let species spread into new territory. When they break apart, populations become isolated and evolve separately. The fossil record is full of these inflection points. One well-studied example comes from the Late Ordovician period, roughly 450 million years ago, when tectonic activity intensified in what is now eastern North America. Phylogenetic analyses of marine invertebrate fossils show that this tectonic pulse triggered a fundamental shift in how new species arose. Before it, most speciation happened through geographic isolation as populations were separated by physical barriers. Afterward, the regime flipped to one dominated by dispersal, as new ocean currents and habitat changes opened pathways for species to move into new basins. Invasive species from outside the region became established, and speciation rates within the native fauna were actually suppressed.14PubMed Central. Geologic drivers of late ordovician faunal change in laurentia: investigating links between tectonics, speciation, and biotic invasions
That pattern has played out repeatedly throughout Earth’s history. The formation of Pangaea brought previously separated faunas into contact, triggering waves of competition and extinction. Its breakup isolated populations on different continents, leading to the wildly different mammal faunas of Australia, South America, and Africa that we see (or saw, before humans started moving species around). A future supercontinent would presumably do something similar in reverse: as continents merge, species that have been evolving in isolation for hundreds of millions of years would suddenly share habitat and compete for resources. The resulting ecological upheaval would be enormous, though the specifics are impossible to predict given the timescales involved.
What Happens Deep in the Mantle
The story of future continents is not just a surface story. Deep beneath Africa and the Pacific sit two massive structures called large low-shear-velocity provinces, essentially continent-sized blobs of anomalously dense material sitting at the base of the mantle, roughly 2,900 kilometers below the surface. These structures are not static; they respond to what happens at the surface. Modeling work has shown that the present-day elongated shape of the structure beneath Africa is itself a consequence of ancient subducting slabs from the convergence of Africa and Eurasia pushing the dense material westward over time.15Scientific Reports. The evolution of basal mantle structure in response to supercontinent aggregation and dispersal
This matters for predicting the future because these deep structures influence where mantle plumes rise, and mantle plumes in turn help determine where continents rift apart. When a supercontinent sits over a region of the mantle that is heating up beneath it (because the insulating effect of the landmass traps heat), plumes can eventually punch through the crust and initiate a breakup. The coupling between supercontinent cycles and deep plume activity means that the seeds of the next breakup are probably being planted by the assembly process itself.5Applied Sciences. How Could Supercontinent Cycle Modulate the Periodicity and Phase of Global Plume Heat Flux? The supercontinent that forms 200 million years from now will already carry within it the thermal instabilities that will eventually tear it apart, continuing the cycle.
Why the Timeline Is So Hard to Pin Down
Popular accounts often cite 250 million years as the target date for the next supercontinent, but that number deserves some skepticism. The four proposed scenarios span a range from about 200 to 300 million years, and even those estimates rely on extrapolating current plate velocities forward as if nothing will change. In reality, plate speeds fluctuate. New subduction zones can initiate, old ones can stall, and the collision of two large landmasses can dramatically slow or redirect surrounding plates. The models that produce these timelines are increasingly sophisticated, incorporating mantle convection, lithospheric strength, and thermal evolution, but they are still working with incomplete knowledge of conditions deep inside the planet.
Consider the practical limits of the data. GPS networks give us remarkably precise snapshots of how plates are moving right now, but “right now” in geological terms is an eyeblink. Extrapolating a few decades of satellite data forward by hundreds of millions of years requires assumptions about whether current forces will persist, intensify, or reverse. Paleomagnetic records and geological reconstructions of past supercontinents provide longer baselines, but they come with their own uncertainties about exact timing and geometry. The honest answer is that scientists are confident a new supercontinent will form, because the forces driving assembly are well understood and have operated repeatedly throughout Earth’s history, but the specific layout and precise timing remain open questions that may not be resolved for decades.
One variable that rarely makes it into popular discussions is the role of continental roots. The thick, cold keels beneath old continental interiors, some extending more than 200 kilometers into the mantle, act as partial brakes on plate motion. A continent riding on oceanic lithosphere with active subduction at its leading edge moves fast; one sitting on a deep root with no nearby subduction zone barely crawls. Because the distribution of these roots and the location of future subduction zones are hard to forecast, the tempo of assembly could speed up or slow down in ways that current models cannot fully capture.12PubMed Central. What drives tectonic plates?