Rescuers are reviewing their search for a missing 76-year-old hiker in Tasmania's remote southwest and say there is now "little hope" of finding him alive.
James Hugh McLean, of Flinders Island, was last seen on November 12 before setting off on a one-month walk.
The experienced hiker was trekking the Huon Track walk in the Tahune area and planning to walk to Melaleuca and surrounding areas, before returning on December 13.
However, Mr McLean did not reach his food drop in Melaleuca and failed to return home.
Acting Inspector Andrew O'Dwyer, of Tasmania Police, said more than 100km of walking track has been covered both by air and ground during the week-long search.
"Given the length of time he has been missing, the lack of food sources within the area and the difficulty of the terrain, we must be realistic that if Mr McLean is within the South West National Park, there is now little hope of finding him alive," he said on Thursday.
"A thorough search review will be conducted to re-evaluate any significant leads, clues, calculations and historical intelligence."
Tasmanian Police said they remain in contact with the family of Mr McLean.
© AAP 2018