Exactly. The same applies to any territory claimed by one power or another. The only border that has any meaning is the termini of local mass relays...or as the krogan say; the range of their weapons. It's also why a territorial map of the galaxy would be meaningless since in term of volume, the vast majority of galactic space is unknown and unclaimed. All you could do is colour code individual stars and even if a government laid claim to hundreds or even thousands of systems, a few coloured points scattered against the backdrop of several hundred billion stars...well you'd could hardly tell they were there at all.
I think it's time you started because I've lost track of how many times you've voiced a rather drastic misconception. Seriously, at times I wonder if you're playing the same game as everyone else! Hell even reading the primary ones will do. It's easy really since you don't even have to actually read them. When you select one there's a little audio clip that reads it for you.
In this instance though, you didn't need to open the codex, it was all right there on the planetary screen when you came into orbit. But if that's too much to ask I'll quote it for you.
