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A supercontinent is a large area of land which has more than one continental core, or craton. They are formed by continental plate convergence. Continental plates have periodically collided and assembled in periods of orogeny (mountain building) to form supercontinents. The cycle of supercontinent formation, breakup, dispersal and reformation by plate tectonics occurs every 450 million years or so.

Eurasia is certainly a supercontinent, but the Americas are usually considered separately. Even more clearly, Gondwana and Laurasia were supercontinents formed by the breakup of the global supercontinent Pangaea.

The landbridge between North and South America is geologically a rather temporary link, so they would not usually be described as one supercontinent.

Ancient supercontinents

In order of age