[Alouette]

Will the moat be filled with salt water or fresh water? Fill it with saltwater, that way they can't use it to drink or irrigate.

I don't know if piranha or crocodiles can survive in a saltwater.

So fill it with sharks and stinging jellyfish.

[Red Badger]

Crocs don't much care, I believe, either way, salt or fresh. Piranha, on the other hand, do require fresh. Barracuda, some sharks species and some poison lion fish, rock fish etc. can be substituted.......

[af_vet_rr]

So fill it with sharks and stinging jellyfish.

Dr. Evil : You know, I have one simple request and that is to have sharks with freakin' laser beams attached to their heads!

[SJackson]

So fill it with sharks and stinging jellyfish.

Either skip the jellyfish or ban export of the Israeli sunscreen keeps the jellyfish away