Originally Posted by
NickB
As someone who grew up in the area, I can confirm that we don't pronounce the final 's' in Cassis (the town, that is). My grandmother always used to say 'Cassiss', but then she was a Northerner
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I've spent a fair amount of time in Cassis and find, as posted by NickB, that the residents pronounce it w/out the final 's'; the liqueur, of course, uses its final 's'.