UPDATE – apologies, but has been confirmed that the ditch is next to the Park, per the following link, and therefore is on the early bird loop:

https://maps.google.com.au/maps?q=-32.030263,115.778904&hl=en&ll=-32.029681,115.778646&spn=0.007104,0.016469&num=1&t=m&z=17