I'm a new editor, but I rode a marked off road trail connecting Hwy 12 and Sideroad seven, contiguous with (and named on the map) Thorah Concession Road 4. Half way between the two roads, this trail turned into a totally impassable marsh. I was badly stuck and got pretty hurt navigating out of it. It was a literal quagmire. I have marked it impassable and it now does not appear on the standard or Cycling layers.