Cells with no critters / leveled critters / NPCs: (-15, -18), (-14, -20), (-13, -15), (-11, -19), (-11, -18), (-10, -20), (-9, -19), ...
Cells with only one critter / leveled critter / NPCs: (-15, -20), (-15, -19), (-14, -18), (-12, -20), (-12, -19), (-12, -15), (-11, -16), (-10, -18), (-10, -19), (-9, -21), ...
(I have not looked further east in the CS, but ingame it was the western parts that made the most barren impression on me anyway.)