|Sandopolis did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):
Sandopolis Zone is a location in the Sonic series. It made an appearance in Sonic the Hedgehog 3.
Sandopolis Zone makes an appearance in Sonic Heroes 2. In Team Knuckles' story, Knuckles and Shade attack the zone when they search the zone for Master Emerald shards.
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