Police are appealing for information in the search for a pensioner missing for almost three weeks.
Glyn Smith, 76, from Cambridgeshire, was last seen in the Highlands on Sunday, April 24.
He is thought to have been on a walking tour of the north of Scotland when last spotted in the Oykel Bridge area of Sutherland.
Mr Smith is described as being white, around 5ft 6in tall and of slim build.
It is believed that when last sighted, he was wearing outdoor type clothing and was carrying a rucksack.