PC: Corinth Canal cutting off the Peloponnese for 1000+ years?

I almost posted this at 11pm last night but decided to wait until morning—given my track record, I’d never get any kind of response otherwise ;)

Anyway, I just recently learned about the existence of the Corinth Canal in Greece, which technically makes the Peloponnesian Peninsula into the Peloponnesian Island, but where I first learned of it implied that it had never been created IOTL. It was in an encyclopedia I’ve started taking notes from recently and said that Caesar had planned to start it but then he was assassinated so it never went through. When I got back to the house later that day, I decided to look it up and learned that, in fact, the canal has been around since the late 19th century. that seemed to put a damper on ideas that had come to me when I first learned about it* but I thought I’d post the question here and see what everyone thinks. There’s gotta be at least one AH.commer more knowledgeable on this who could enlighten me :)



*like if the Peloponnese becoming an island could protect it from the Ottoman conquests; could make it some kind of rural backwater that no one cares about; if it could be some kind of eastern Sicily; and what the political geography would be like especially since now it would be geographically cut off from Athens and therefore what would happen to northern Greece and if the Peloponnese would in turn be part of an Aegean Republic instead, meaning that Greece as we know it wouldn’t even exist anymore
 
Well, boats do exist. I can't see the existence of a canal causing the Peloponnese to be any more forgotten about than it already was.
depending on how history goes, it could stifle overland travel to and from the Peloponnese, just like any other island. if the canal was built by the Romans then i imagine they'd build bridges, too, but a millennium is a long time and those bridges could easily be destroyed, either deliberately to try and prevent an invasion or just as a consequence of war
 
The isthmus was already a strategic point to defend, a tiny canal like the Corinth Canal wouldn't make it necessarily much more defensible. Looking at this picture on Wikipedia, any conquering army worth their salt could build a makeshift bridge easily. The Corinth Canal is tiny, you could probably fill it in to cross it. Indeed, nature already does that since the canal is very vulnerable to landslides and is in an active earthquake zone.
 
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