Mushroom Hill Zone (Classic Sonic's world)

Mushroom Hill Zone is a location that appears in the Sonic the Hedgehog series. It is a forest Zone on Angel Island, and an alternate version of Mushroom Hill Zone from another dimension set in the recent past.

Description
Mushroom Hill Zone is a forest-covered region filled with extremely tall and straight trees with brown bark and lush tree crowns. However, what makes this Zone recognizable are the multicolored mushrooms that grow there. While some of the local mushrooms are small, most of them are colossal in size, with the largest of them being at the size of buildings.

Sonic Mania Adventures
During one winter in Mushroom Hill Zone, Amy would drag a non-operational Metal Sonic through the Zone on her way to Dr. Eggman's lair, all in an effort to return Metal Sonic to the doctor.