The Grampians Peaks Trail is a memorable multi-day hike through the rugged interior of the Grampians National Park, beginning and ending at Halls Gap. Over three days, two nights and 36km, experience dramatic mountain peaks, rugged rocky outcrops, unforgettable panoramas and the ancient Aboriginal heritage of Gariwerd. The Grampians Peaks Trail is well signposted but includes very steep sections and many obstacles. Only experienced and well-prepared hikers should attempt it.
Note there is a new, longer (160km) linear trail of the same name: https://fastestknowntime.com/route/grampians-peaks-trail-vic-australia-0
This should be listed as Grampians Peak Trail - Stage 1 or Grampians Peak Trail - Central Loop as the Grampians Peak Trail is scheduled for completion this summer and will be ~164km in length