Busselton Police are concerned for the welfare of 31-year-old Busselton man, Christopher Charles Frendo, who has not been seen since Wednesday.
The last sighting of Mr Frendo, was by an acquaintance as he was refuelling his white 1997 Holden Rodeo utility registration BSN 13207 at a service station in Busselton.
At that time he indicated he was going to head into the bush to photograph wildlife.
Police say the Nannup area is one place Mr Frendo might have been headed.
Nothing has been heard from him since that time, raising fears for his safety.
He is described as being 185cm tall, medium build, brown hair, brown eyes.
Anyone who spots the vehicle or who has any information on the whereabouts of Mr Frendo is asked to call Crime Stoppers on 1800 333 000.