Zombies Cannot Swim

Even if they could swim, they'd never penetrate my Zombie Fortress. Mwahahaha!

Who cares if they can't swim. Zombies don't need to breathe. And they eat sharks.

http://www.youtube.com/watch?v=uOSN2s8FY8Q

Depends. Fulci zombies can walk on the bottom of the body of water. IRL - a corpse will float as long as it continues to decompose. Sometimes they will make a big "burp" and then sink. But they will come back up as soon as more gasses are released during the decomposition. So if they are still a zombie and they do have coordination, they can probably do like a float and swim kind of deal. If you have a boat, just make sure the zombies floating by don't have arms.