[Sherman Logan]

Venice has always been built on islands in a marsh. It’s why they built the city there.

Too wet for armies, and too shallow for navies.

That’s why they remained unconquered for well over a thousand years.

[Vigilanteman]

Partially correct. The main part of the city was built on islands in the Venice lagoon for the reasons which you mentioned. But the city and empire had grown to such a point, that much of it extended to the neighboring peninsulas by 1600s, large parts of which have since been abandoned and/or reclaimed by the oceans and marshlands.

There was an interesting article in National Geographic not so many years ago which, on one hand, was pushing global warming with "Venice is about to become a victim!" theme while on the other, outlined the long history of the city with its centuries old ebb and flow of reclaiming land from the oceans and marshlands when the city prospered to letting nature reclaim parts of the city when it did not.

Makes one wonder how someone able to document that long historical perspective can also shill for the Chicken Littles who claim global warming is a recent man-made crisis.