Like the Cracked Cistern in Kozama'uka. It is there, a little settlement hidden in its little corner of the map, but it just doesn't feel alive at all! When you come there outside of the two or three side quests that give you a reason to talk to someone there, none of the npcs there even have names or dialogue. Considering the backstory of what it represents, that place could have been actually really interesting, with its own needs and offerings and little activities and quest hooks!
I kind of hope that maybe it will be one of the Allied Society quest locations -- but even if they add flavor to it at a later time through side content, there is no real excuse for why it falls so flat in the base game when we are actually getting our first impression of that corner of the map!