Heck, we could take that even further by weaving in some of your other listed items.
The fantasy world equivalent of Crater Lake could be an enormous cenote, formed when the analogue to the city of Ubar collapsed into a gigantic water-filled cavern beneath it. The city really was destroyed as punishment by the gods, which included transforming the inhabitants into aquatic monsters, who still inhabit their drowned city.
The lake connects via underground rivers to other cenotes across a widespread region. Local human inhabitants place offerings into the cenotes to placate the "fish men" and dissuade them from raiding the humans.
(Speaking of Crater Lake, if you can't do something fantastic with Wizard Island and the Old Man of the Lake, you're just not trying.)![]()




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, but I think this rounds out everything striking and fantastical that I can find. It'll probably take a couple of posts to properly cover these, after which I shall retire from this thread. 
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