Douglas Sims, 68, and Ena Melville, 62, were supposed to return home after a camping trip in Western Australia’s Outback region.
They haven’t been seen since September 30.
Their grey Toyota Prado was last seen near the town of Warburton.
Their relatives are worried about their welfare. They were supposed to return to Margaret River on Sunday.
Ena Melville is described as having blonde hair and blue eyes, while Douglas Sims has grey hair and a beard.
They were last seen near the Aboriginal community of Warburton.
Due to the heavy rainfall that occurred in the region, numerous road closures have been implemented. A land search has not yet been carried out for the couple.
The police are concentrating their efforts on the area around Warburton and Connie Sue Road.
A helicopter will also be used in the search operation.