Angel Island

Angel Island is an island located on Mobius, it floats by the power of the Master Emerald (it doesn't float in the series) which is guarded by Knuckles the Echidna and has various mountains and beautiful forests. Various badniks roam this island, through the forests and the landscape. The same goes for various animals, including Flickies for example. It's also where Robotnik's Lab is at.

Sonic returns back at this location, after his heroic duty in another world. But he sees various holes in the ground, it is the Eggman who is searching for the Chaos Emeralds.