Green Flag to hide hitboxes, more features soon. Area names are subject to change. Maybe after completing the three subareas, the player goes to a smaller town of sorts (colored pink) and goes through his home color state and travels west through a another color state until they reach another town, represented in brown. After exploring a bit, they find some sort of weapon, a sword/bow, to defeat the greyscales. They find a secret tunnel leading back into the Echoing Wilds, next to a bridge. The bridge goes to a small area that explains a bit more lore and is a sort of harder area to prepare the player for the final dungeon and boss fight.
The purpose of having a map is to show the player's statistics for a certain area. This is NOT supposed to be a level select but instead used to show how many coins you've collected or something along those lines.