The canyon leading from Borealis to Holes in the Wall is a place where I frequently stumble over invisible wrinkles in the ground. It's generally annoying, as you have to jump your way through this maze of toe-stubbers.
Come to think of it, Last Ditch is equally annoying, in the area of the scanner/bank and whompa. These are areas I frequently visit. I am sure there are others.
Break out the steamroller please and get the wrinkles sorted, will you?