From this article on the official web site :
« the hand of pica was the size of city in dressrosa »
Thanks to @Aknolagon
Which mean that Pica’s golem is at least island level.
Yep you read it right Zoro has a island level feat :finally...
Today I received the French translation of the part 2 of Ace’s novel. I decide to make this recap because some people could not find the previous summary.
For the people asking, this novel is as canon as the databook VC.
Also thanks to @EtenBoby for the corrections;)