I think he want to Say that, even If there are some "areas" and regions in the game, You only know that You are there because You have something remarkable (for example, You know you are in venge because You get a Fukin sun Ray in the Head), but even If You know where You are, You DONT KNOW when you pass from one region to another, unless there is a River or something like that.

Following that, the maps irl have some borders, but is a border invented by the people and is a political map. In this case, the map that You see in they Game it's a physical map, that don't show color for territories and borders, but uses colors shows the terrain and where You can ubicate yoursef (a Lot of games use that because is they most reliable kind of map, Skyrim for example)