The ancient past of South Island was a lush tropical paradise with firey volcanoes and snowy peaks.
Tropical Plant: a jungle paradise near the warp point.
Hill Top: the ancient version Green Hill with volcanoes. The ground is very unstable.
Blue Lake: a lake in Woods zone. This would become Blue Ocean, with whales and a rideable submarine.
Rock World: a snowy version of Sand Shower.
Olympus: another warp point. This is also Hidden Palace.