Marble Zone
Location- South Island
The Marble Zone is an area which contains a large amount of lava and underground buildings, as well as some above ground ruins. On the surface, patchs of land exist between pools of lava and sometimes on the pools, which make them dangerous to travel on, as a bit of weight can lower them into the lava pools.
Games Appearing in-
Sonic 1 (MD), Sonic Drift (GG)
~ The Western Manual refers to the underground structure as an underground Palace, which would go with the style of the place looking like some long lost civilisation lived there.
Animals found Here-
Walrus, Squirrel
Image from- Sonic 1 (MD)