Think of when you go to the airport and you go through the security check. There's a bunch of people walking around aimlessly until you get to the security check and everyone has to go through the same spot.

Now think of your area and imagine if the deer are going from one spot to another there may be an area they HAVE to go through to get there. They're not going to go straight up or down those cliffs so they have to walk around them. Switchbacks would be good. Lots of times loggers will use the best path so the logging roads might go through a funnel. Check the stream, there might be a narrow area with little to no current, that might be where they prefer to cross.

I have the same problem here in MD. All of the land I hunt is flat as my high school girlfriend. I find funnels in brush lines, one I have is from a wood lot to a field, there's one area that's really thick right up to the field edge while the rest is open, that's where they like to enter the field.