Worst Leveling Progression Spots

[skarlorn]

lets move away from "efficiency" and move back towards ignorance.

lets abandon the idea of cruising your way on EZ street and embrace getting crushed by a white con monster in an unused dungeon.

If you had to suggest the WORST places to level, in terms of efficiency, danger, least populated (i.e. hard to get a group)... what would you say?