Published Thursday, 09 January 2014
Police in Scotland are conducting the search in Loch Rannoch. (© Getty)
The 64-year-old man from Northern Ireland was walking near Loch Rannoch, Perthshire, but has not returned to his car which has been parked in the area since Christmas.
He has been described as 5ft 6in with a slim build and grey hair and is said to be an experienced hill walker.
Police want to speak to anyone who has been in the area over the Christmas holidays and may have seen him.
A police Scotland spokesman said: "Although an experienced hill walker there has been no contact made with him for several days and we are keen to speak with any persons who may have been in the area, particularly the area around Ben Alder, who may have seen or spoken to the male."
© UTV News