This category is for all locations in the Sonic the Hedgehog series that have been mentioned but never made a visual appearance.
To add an article to this category, put [[Category:Unseen locations]] in that article.
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Christmas Island -
Donpa Kingdom -
The Bucket O'Sushi -
Beanville -
Angel Island (Sonic Boom) -
Downunda (Dark Mobius) -
North Cave -
Soleanna (Pre-Super Genesis Wave)
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