Sonic have a lot of islands presents in its ocean. They're the main location where live the Animal People, while the humans live more in the continents. Their social organisation is less hierarchized and based on domination than what happens on the continent. They often have been attacked by the like of Dr. Eggman.
## South Island
One of the most important place in Sonic the Hedgehog, where Sonic and Eggman battled a lot over the fabled Chaos Emeralds. This island is well-known for being the location of the Green Hills.
### The Green Hill Zone
The most well-known and seen everywhere zone of Sonic's earth ! It have been affected a lot by different plot from Eggmans
- Green Hill Zone
- Mecha Green Hill Zone
- Desertified and mechanized area created by Eggman
- Lost Valley
- Guardian Rock
- Arsenal Pyramid
### Other natural zone
- Jungle Zone
- Mystic Jungle Zone (ruined area, transformed into a park by Eggman)
- Luminous Forest
- Casino Forest Zone
- Aqua Road
- Leaf Forest Zone
- Floral Forest Village (IDW)
- Vanilla's Home
### Cities
- Sunset City (name from IDWSonic)
- Ghost Town
- Park Avenue
- Sunset Heights
- Red Gate Bridge
- Emeraldville Ruins (IDW)
- Restoration HQ (IDW)
### All zones
- All levels in Sonic 1 and Sonic 1 GG
- All levels in Sonic 2 (GG/MS)
- All levels in Sonic Chaos
- All levels in Sonic Triple Trouble
- All levels in Sonic Blast
- The Great Labyrinth (under the island)
- Some levels of Forces
- Mystic Jungle Zone
- Metropolis Zone (Forces)
- Eggman Empire Fortress
- Most Sonic Advance Level
- Most Sonic Advance 2 Level
## Other islands
- Westside Island
- Mirage Island ([fanon name](https://sonicretro.org/2016/08/31/sonic-hedgehog-4-island-finally-name/))
- Never Lake
- All levels from S4E1
- All levels from S4E2
- Flicky Island
- All levels from Sonic 3D Blast
- Newtrogic High Zone (A.K.A. The Island of Miracle)
