Emergency services have mounted a search for a man missing after he set off on a hike in Victoria's east.
Richard Johns, 52, started the trek from Halls Gap in the Grampians National Park to Boroka Lookout, 15km away, about 2pm on Saturday.
His family notified police he was missing about 9am on Sunday after he failed to return and they did not hear from him.
Victoria Police's air wing is searching for Mr Johns, along with officers on foot, Parks Victoria workers, and State Emergency Service volunteers.
Police said Mr Johns is British and not familiar with the area. He was last seen wearing a blue zip-up jacket and blue pants.
The search comes as hope fades for authorities to find missing grandfather Christos in the Dinner Plain area in the state's west. The 70-year-old, whose surname has not been disclosed, was last seen on Friday, May 13, leaving his accommodation for a walk.
Victoria Police said on Saturday they were scaling back their search efforts for Christos, noting they have continually sought specialist advice about the harsh alpine environment.
"The extreme conditions faced by someone lost in this harsh and unique alpine environment has shaped search efforts to date," police said in a statement on Friday.
Police urged anyone with information about Mr Johns' whereabouts to contact Ararat Police Station. They urged anyone who saw Christos to call triple zero.
