South Island

South Island (サウスアイランド, Sausu Airando) is a location in the Sonic the Hedgehog series.

It is an island in the Great Rivers Archipelago, where Tom, Sonic the Hedgehog and their allies have battled Dr. Eggman on several occasions. South Island is rather known to be a trove of gems and some ancient ruins, that supposedly shifts along the water due to some connection to the Chaos Emeralds. The island is also inhabited by animals.

"."
 * —About South Island.

Visitors

 * Breezie the Hedgehog
 * Dr. Eggman
 * Silver Sonic
 * Team Sonic
 * Sonic the Hedgehog
 * Tails the Fox
 * Knuckles the Echidna
 * Super Special Sonic Search & Smash Squad

Points of interest

 * Final Struck
 * Green Hill
 * Mecha Green Hill
 * Underground Mine
 * Marble Ruins
 * Scrambled Egg
 * Spring Yard
 * Labyrinth Maze
 * Star Light Highway
 * Scrap Brain
 * Bridge Rainfall
 * Rad Jungle
 * Sky Base
 * Sky High
 * Aqua Lake
 * Gimmick Mountain
 * Crystal Egg
 * Turquoise Hill
 * Gigalopolis
 * Sleeping Egg
 * Aqua Planet
 * Electric Egg
 * Yellow Desert
 * Red Volcano
 * Blue Marine
 * Silver Castle

History
South Island is a holding that was exploited by the duo of Dr. Eggman, Jack and Julian Snively, who stole its resources in order to refine them in facilities like the Chemical Plant on Westside Island. Sonic the Hedgehog clashed with Eggman on a number of occasions on South Island, looking to free its inhabitants from the doctor's tyranny and collect all of the Chaos Emeralds.