Based on evidence for Plate Tectonics it appears that the supercontinent, , occurred approximately 200 million years ago when most of the continental masses had come together.

This is known as Pangaea.

Explanation:

Pangaea was a supercontinent which existed approximately 200 million years ago. All the continents we now know in the world were assembled as one main continent and began separating until they formed the world as we know it today.

This is based on the evidence for Plate Tectonics, which have moved throughout the centuries to create the continents we now know and which are still in movement to this day, shifting.