I hate that corner of the map. Regardless of terrain, you should just map it as "Don't go in here" (exception for the bike trail along the stream).
I can't remember a control there. I went through there once and regretted it.
I am so tempted to use symbol 709 (ISOM2017) and make it out of bounds.
I've had to go there to pick up a score control when I was planning to sweep the course - or most years for one or two map hike controls. And yes, I often regretted it.