Grave fears for man missing near Dwellingup

There's grave fears for a 66-year-old man who has now been missing near Dwellingup for over two days.

Francis Ernest Nelson, known as Frank, had been camping in the Nanga Brook area and was last seen leaving his campsite about 4.30am on Saturday with his canoe.

About four hours later, rangers found his empty canoe and paddle floating in the river near Bob's Crossing.

Mr Nelson's vehicle was parked nearby on Murray Valley Road.

Despite an extensive search by Water Police, Mounted Police, SES volunteers and drones, there has been no sign of Mr Nelson.