- The Illawarra Fly Treetop walk is 500 metres long with an average height of 25 metres. - Knights Tower is 45 metres high. - The Treetop walk has a 280km/hr wind speed design. - The cantilevers can hold a maximum weight of 28 tonne or 800 wombats!! - The Treetop walk holds an average of 400kg/m2.