Siphonia Earth with most of the ocean siphoned off, leaving just shallow seas on the abyssal plains 4-5 km below our coasts. It's a wild, steamy topography down there, while the old continents turn alpine...	Inversia Up is down and down is up! Land is sea, sea land; trenches are peaks, peaks trenches islands and reefs are lakes lakes are reefs and islands...	Abyssia start with Inversia's inside-out geology-- now pour on as much water as Earth has. Miles-deep seas, with tiny continents where our abysses and trenches lay. Unrecognizable, yet weirdly familiar...

If you like this sort of thing, an earlier set called Tilt! postulates four alternate Earths made by removing a globe from its stand, drilling new poles, and sticking it back on, crooked. Now pretend it's always been that way. How does Earth behave ecologically, tilted or upside down or sideways? Answer: very strangely indeed. Some parallel Earths aren't even recognizable...

Two more sets of world-models: The Biosphere Variations and Futures -- Home page for all four sets: Planetocopia