Free camping with caravan in Greece

Well, maybe it seems a bit odd, me, a Greek, asking you, if you ever camped in Greece.

I know what you propably think: He knows the language, he knows his country and he is asking us where to camp!!!

You know, I didn't get to find anything regarding this at Google. The results are null. I can't find any info, so I am asking you guys, "Have you ever camped not in a camp site, in Greece? If yes, where was that?"

I am thinking for the Ionian cost this year, but you propably have other sugestions.

Thanks,