Well those are all nice sugestions but here are my lands and the zombies that inhabit them

1. the mainland
basic zombies and maybe a few zombie rats

2. gaia cove
voodoo style zombies
and a stowaway from the mainland

3. monster arena
all manner of wrestling zombies from necrohammer zombies to zombie cultists

4. jamaca bay
no voodoo zombies but plenty of pirate zombies to kill and prystoric zombies on the other side of the island

5. the mall of the future
cyborg zombies and robots with zombie brains

6. dark city
simply normal zombies with guns

And those are a few of the lands I have in mind. I plan on using one more to represent the fight with the super devil but only my players will get to see my final land... The end of the world.