Warp wrote:

>   Its curious how common this island shape seems to be. I guess it has
> something to do with volcanism.

It's probably a coral attol.

Volcano rises from the sea bed, coral grows on the part just below the 
water's surface, volcano sinks back below the waves, coral grows upward 
as fast the the volcano sinks downways. A few million years later... 
weird circular island.

-- 
http://blog.orphi.me.uk/
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