Any ideas my good man or maybe this problem relates to your sig ie; there is no easy solution to this....
Well yeah, its not particularly easy. part of the problem is that that vast tract of green land bounded by Heathcote Road, New Illawarra Road and the Georges river is covered in lines and owned by a vast variety of different land managers. From the top of my head they include Gandangarra (essentially private property), ANSTO, The Tip (WSN or whatever their name is this week), NPWS, Sutherland Council, Whiterock Quarry, possibly some crown land and some private landholders.
So a single trail could cross multiple land tenures which is a major headache.
Sorry, no real solutions there, just ideas of why its tough to do advocacy out there.
Check out the Sutho council maps website if you are interested its pretty cool.
https://mapping.ssc.nsw.gov.au/Sutherland/
You'll have to zoom in almost all the way to see the yellow property lines but it will give you an idea whats there.