Green Hill Zone (Location) - Giant Bomb

Widely considered to be one of the most iconic locations in the Sonic series, Green Hill Zone has appeared in several games made by SEGA.

Green Hill Zone Games - Giant Bomb

Sonic and the Giant Bomb by ChibiBeckyG on DeviantArt

Green Hill Zone Games - Giant Bomb

Resistance Damage Report: Green Hill, South Island [Sonic Forces Overclocked] : r/SonicTheHedgehog

Green Hill Zone Games - Giant Bomb

Emerald Hill Zone (Location) - Giant Bomb

Green Hill Zone (Sonic Mania), Sonic Wiki Zone

Green Hill Zone screenshots, images and pictures - Giant Bomb

Green Hill Zone (Sonic the Hedgehog 16-bit) - Sonic Retro

Guide for Sonic The Hedgehog (Arcade) - Playthrough 1: Chaos Emeralds