Westside Island is a location that appears in the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics. It is an island in the Acorn Archipelago that host Mobotropolis, the capital of the Kingdom of Acorn.
Mobotropolis was built on Westside Island, and eventually came to be ruled by King Nigel Acorn. After Dr. Eggman initiated his coup, he took over the city, but left it in its previous condition, something that Rotor the Walrus saw when he arrived in the city. Years later, the Freedom Fighters would liberate the city from Eggman's clutches and restore King Acorn to the throne.
Nigel's reign would later come to be interrupted again when wizard Walter Naugus imprisoned him using technology stolen from Dr. Eggman. Sonic the Hedgehog and Miles "Tails" Prower came to rescue him after receiving no word from Nicole the Holo-Lynx, who went to Castle Acorn to investigate.
- Casino Night Zone
- Chemical Plant Zone
- Emerald Hill Zone
- Hidden Palace Zone
- Metropolis Zone
- Mystic Cave Zone
- Royal Hills Zone
- Wood Zone
- Westside Island's name comes from West Side Island from the game Sonic the Hedgehog 2, which serves as the game's main setting.
- The locales of Westside Island appeared in the version of reality created by the first Genesis Wave (Sonic the Hedgehog #228-#229).
- In the pre-Super Genesis Wave reality, many of the Zones currently associated with Westside Island were situated on the continent of Northamer.