If you have seen the Phantasy Star Gaiden
title screen, you may recall that it displays a circular representation of the game world. This is a more detailed drawing that of that map, likely used as a basis for creating the sprite. It is accurate to the in-game world, but the circle-like nature places some locations a bit closer together. To the best of my knowledge, this drawing was never published by Sega until the release of Phantasy Star Complete Collection
, where it was included in the Phantasy Star Gaiden
gallery. It is not even in the game manual, like most of the other gallery artwork for the title.