The Great North Walk is a walking track which runs from Sydney to Newcastle in New South Wales, Australia. The main track, 250 kilometres (160 mi) in length, runs between the Obelisk in Macquarie Place in Sydney to Queens Wharf Tower in Bicentennial Park in Newcastle and is well sign-posted. There are many "side tracks" which link the track to populated areas along the length of the walk. The walk includes a huge variety of wildlife and scenery. (wikipedia)
We already have several caches at points along the GNW, including an EarthCache. This one is placed near where the walk ascends/descends from the ridge along Trig Rd into the Congewai Valley.
The cache is hidden close to the GNW itself, but muggles should be minimal.