Plausibility of Massive Maelstroms

Maelstroms are ginormous whirlpools. They can exist continuously in an area. They're cool.

The question is, how large can they get? As large as an island? Could a maelstrom have a diameter of 60 or 100 km?

If so, could they be formed or maintained by natural causes and structures so that one could encircle an island constantly (as big as Jamaica for example)? As in, having an effective source beneath the island? (I know islands don't have sea under them, I'm talking about the effective center of the whirlpool)

What about a group of islands, where a massive maelstrom has a source between them? Could the tides encircle an island group (like the Seychelles in size)?

I'm asking if such a thing could exist with contrived (if necessary) but natural causes.

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Plausibility of Massive Maelstroms

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