Green Hill (グリーンヒル Gurīn Hiru?), also known as Green Hill Zone (グリーンヒルゾーン Gurīn Hiru Zōn?), is a location that appears in the Sonic the Hedgehog series. A natural paradise of a Zone, Green Hill was the first location Sonic the Hedgehog passed through during his mission to free South Island from the tyranny of Dr. Eggman. Since then, the Zone has returned in many shapes and forms, although always as part of Sonic and his allies' journey to foil threats to the world.