I took some time to study the map given in this image and managed to highlight out certain areas. Obviously, Green Hill is in this game. I was also able to see Casino Night, Aquatic Ruins, Chemical Plant, the Death Egg, and most of Angel Island (such as the Emerald Shrine, Red Mountain, Ice Cap, Sandopolis). Though I couldn't place Emerald Coast, and there's one area just north-west of Chemical Plant I couldn't figure out. All I could see were Item Boxes.