Though the general consensus is that Planet Banimon is round, nobody knows where that notion came from, nor has it been proven. There are vast, unexplored (and presumed uninhibited) areas of harsh planetary desert, with a small oasis of civilization between the two oceans. Here is a map of the thus charted territories:
KNOW YOUR BANIMON
Flip through the characters to get to know each one of them (Flash required):