The Emerald Hill Zone was a region consisting mostly of trees, rectangular shaped rocks, grass, and water.
During the period when Dr. Eggman's Operation: Clean Sweep altered reality and reshaped Mobius, Sonic and the the Freedom Fighters arrived here after defeating Dr. Eggman in Final Zone. They met up with Sonic's friend, Tails, and Sonic introduced him to the Freedom Fighters. It is here where Tails was working on Sonic's plane, the Tornado. The worst earthquake tremor yet hit while the group was here, and they decided to head to Eggman's next factory, the Chemical Plant Zone. (StH:#228)
- The Emerald Hill Zone was originally in the second Sonic the Hedgehog game. While unnamed in the comic, the zone's design is based on that of Emerald Hill Zone from the game and is considered the official name of this zone until further notice.