South Island/Pre-SGW

South Island is an island on Mobius.

History
South Island was one of several stops that King Max had scheduled on his world tour to raise support against the Eggman Empire. (StH: #138)

Background Information

 * South Island was the main setting for both versions of the video game Sonic the Hedgehog for Genesis and the Master System/Gamegear, alongside Sonic Chaos, and the 8 bit version of Sonic the Hedgehog 2. Thus, it can be presumed that the Green Hill Zone and other levels of these respective games exist on South Island in the Post-Genesis Wave Reality.
 * While not outright confirmed, other titles like Sonic Triple Trouble, Sonic Adventure 2, Sonic Battle, and the Sonic Advance trilogy might also take place on/near the island, due to them featuring the Green Hill Zone as a returning level.
 * In Japan, according to the story for the Genesis video game Sonic the Hedgehog, South Island can't be found on any map, nor is it set in one location. It moves across the sea, possibly as a result of the Chaos Emeralds. Whether or not this information applies in the Pre-Super Genesis Wave Timeline (or even in the "modern" Sonic video games) is currently unknown.