In the near future — 250 million years or so — the Great Lakes will completely disappear, Africa will crash into New York and Antarctica will merge with Brazil. The continents are in constant motion. Thanks to plate tectonics, continents crash together and break apart, oceans shrink and widen (the Atlantic Ocean is spreading about one inch per year), mountain ranges lift and landmasses rearrange. The last time all the landmasses were together was 200 million ago when dinosaurs walked the Earth. Scientists have named that supercontinent Pangea (meaning, whole land). Prior to this, scientists believe the continents drifted around to create at least 6 other supercontinents. They are (in reverse order): Pangea, Pattonia, Rodinia, Columbia (Nuna), Kenorland, Ur and Vaalbara (though this one is only theoretical). Click here for more on this.
Since the days of Pangea, the landmasses broke up and drifted (and are drifting now still, even as you read this) apart. But they can drift only so far before they crash into each other again, forming a new supercontinent. It has a while to form but it already has been given a name: Pangaea Proxima. National Geographic cartographers created a cool map that imagines what the world might look like then. Plan your vacation travel accordingly.