Yes, Earth’s continents will almost certainly merge into a new supercontinent roughly 200 to 250 million years from now. This isn’t speculation. It’s what the planet has done repeatedly for billions of years, and the tectonic forces driving it are still active today. The continents are moving right now, at rates of 2 to 15 centimeters per year, and their trajectories point toward an eventual collision.
Why Supercontinents Keep Forming
Earth’s continents sit on tectonic plates, which float on the mantle like rafts on a slow, churning current. The planet’s molten core heats rock at the bottom of the mantle, causing it to rise. Meanwhile, cooling slabs of crust sink back down at subduction zones. This circular flow, called mantle convection, drags the plates around, pulling continents apart in some eras and pushing them together in others.
This process follows a pattern geologists call the Wilson Cycle: a continent rifts apart, a new ocean forms and widens, that ocean eventually starts being consumed by subduction, and the ocean shrinks until the continents on either side collide again. The whole cycle takes roughly 300 to 500 million years. Critically, the zones where continents previously split or collided remain structurally weak, making them likely sites for future rifting or collision. The Earth essentially recycles its own fault lines.
Earth Has Done This at Least Five Times
Pangea, which existed about 250 million years ago, is the most famous supercontinent, but it was only the latest in a long series. Before Pangea, there was Rodinia, which lasted from about 1.1 billion to 700 million years ago. Before that came Columbia, which assembled around 1.8 billion years ago. Even earlier, smaller landmass groupings called Ur (around 3 billion years ago), Arctica (2.5 billion years ago), and Atlantica (2 billion years ago) formed and broke apart.
Each time, the pattern repeated: continents drifted apart, oceans opened, subduction pulled the continents back together, and they merged. Pangea itself formed when the southern landmass Gondwana collided with the northern landmass Laurasia around 250 million years ago. It began breaking up about 175 million years ago, creating the Atlantic Ocean in the process and setting up the Ring of Fire, the arc of subduction zones that encircles the Pacific.
Four Competing Models for the Next Supercontinent
Scientists agree a new supercontinent is coming. They disagree on the details. Four main models predict different outcomes based on which oceans close and how the continents move.
- Pangea Proxima: The Atlantic Ocean reverses course and closes. The Americas drift back east, colliding with Europe and Africa. A small remnant of the Atlantic is all that survives. This model places the new supercontinent in a position similar to the original Pangea, centered near the equator.
- Amasia: Neither the Atlantic nor the Pacific fully closes. Instead, continents drift northward and collect around the Arctic Ocean. Eurasia has already run into the Ring of Fire, and as it moves laterally along that subduction zone, it eventually collides with the Americas. This model predicts a polar supercontinent, centered on today’s Arctic, forming as early as 50 to 200 million years from now.
- Novopangea: The Pacific Ocean closes. This is the simplest scenario, since the Pacific is already shrinking as the Ring of Fire consumes its edges. The Americas would drift westward until they merge with Asia and Australia.
- Aurica: Both the Atlantic and the Pacific close, requiring a new ocean basin to open through the middle of present-day Asia. This is the most dramatic scenario and perhaps the least likely in the near term.
The Amasia model has gained significant traction in recent years. Its central insight is that continents tend to drift “downhill” toward subduction zones, where the mantle is cooling and sinking. Geologist Ross Mitchell calls these zones “subduction girdles” because continental plates, too thick to be pulled under, pile up along them and can only slide sideways, collecting more continents as they go. This is how Gondwana became Pangea, and it may be how Eurasia and the Americas eventually merge.
How Fast the Plates Are Moving Now
To get a sense of the timeline, consider current plate speeds. The Mid-Atlantic Ridge, where the Atlantic is widening, spreads at about 2.5 centimeters per year, or 25 kilometers every million years. The Pacific Plate grinds past North America along the San Andreas Fault at about 5 centimeters per year. The fastest spreading on Earth happens at the East Pacific Rise near Easter Island, at more than 15 centimeters per year, while the Arctic Ridge moves at less than 2.5 centimeters per year.
These rates seem tiny, but over geological time they reshape the planet. At 5 centimeters per year, a plate moves 500 kilometers in 10 million years and 5,000 kilometers in 100 million years. That’s roughly the width of the Pacific Ocean. Give the process 200 million years and the math works out: continents that are currently separated by vast oceans will be pressed together.
What the Next Supercontinent Would Look Like
Regardless of which model proves correct, the result would be a single massive landmass surrounded by a global ocean. Mountain ranges far taller than the Himalayas would rise at the collision zones where continents smash together. The interior would be vast and dry, cut off from ocean moisture, much like the deep interior of Asia today but on a far grander scale.
When Pangea existed, this “continentality effect” created enormous deserts in its center while coastal regions remained more temperate. The same pattern would repeat. A single supercontinent also simplifies ocean circulation, which can lead to more extreme temperature swings between seasons and between coastal and inland regions. During Pangea’s existence, terrestrial organisms could migrate nearly worldwide without major ocean barriers, which kept species diversity relatively low and communities broadly similar across the landmass.
A Harsh Climate for Life
The next supercontinent won’t just rearrange the map. It could be lethal. A 2023 study published in Nature Geoscience used climate modeling to simulate conditions on a future supercontinent called Pangea Ultima, set roughly 250 million years from now. The results were stark.
Three factors combine to make the future supercontinent hostile to mammals. First, the sun will be about 2.5% more luminous than it is today, a natural consequence of stellar aging. Second, the breakup and reassembly of continents drives intense volcanic activity, which releases large amounts of CO2. Background CO2 levels on the future supercontinent are projected between 410 and 816 parts per million, with spikes potentially reaching 1,120 ppm. For context, today’s level is around 420 ppm. Third, the sheer size of the continent amplifies temperature extremes far from the coast.
The modeling found that just rearranging the continents into a supercontinent shape, even without any increase in CO2 or solar output, raises global average temperatures by about 3.7°C compared to pre-industrial conditions. When higher CO2 and a brighter sun are factored in, the results are devastating. At 1,120 ppm CO2, only about 8% of the land surface remains within the thermal limits that mammals can survive. The interior of the supercontinent would regularly exceed wet-bulb temperatures that make it impossible for warm-blooded animals to cool themselves through sweating or panting.
This isn’t unprecedented. The last time a supercontinent existed, the end-Permian extinction, roughly 252 million years ago, wiped out about 90% of all species. That catastrophe was driven by massive volcanic eruptions in Siberia that poisoned the atmosphere and collapsed ecosystems worldwide. Vegetation loss was so severe that river systems across multiple continents shifted from slow, meandering channels to fast, braided ones because there were no longer plant roots to hold soil in place.
The Cycle Will Continue Until It Can’t
The supercontinent cycle depends on plate tectonics, and plate tectonics depends on Earth’s internal heat. The planet is slowly cooling. Eventually, billions of years from now, the mantle will cool enough that convection weakens and plates stop moving, much like what happened on Mars long ago. But that endpoint is far beyond the timescale of the next supercontinent. Earth has enough internal heat to keep the cycle running for at least another billion years, possibly longer.
So the next Pangea isn’t a question of “if” but “when” and “where.” The continents are already on their way. Australia is drifting northward toward Asia at about 7 centimeters per year. Africa is pushing into Europe, slowly closing the Mediterranean. The Atlantic is still widening, but subduction zones may eventually form along its edges and begin pulling it shut. The pieces are in motion, and gravity, heat, and time will do the rest.