Here is a zoom-in with some additional help.
Extra care should be taken in the various types of terrain that you may find on these mountains/hills.
You can see on the top of one of them the area where there is "impassable" terrain and the areas where there is "rough" terrain.
You may also notice that the forest areas are not continuous and that the grass areas are grouped to more than 2-3 hexes per group.
