Police say an 83-year-old Greenfields woman may have been laying in a creek for over 24 hours before she was found by SES volunteers.
Margaret Lowden, who has dementia, walked off from her retirement home on Legend Crescent on Wednesday morning.
A land and air search begun at 7.30am on Friday and after three hours she was found by SES volunteers laying in a creek in bushland off Old Pinjarra Road.
Mrs Lowden was taken by ambulance to Peel Health Campus.
Police say she appears to be in reasonably good health despite being missing for 48 hours.
Teen boy killed after being struck by two cars while crossing road in Warnbro
Free supplies, health checks, advice for Mandurah pet owners
Rockingham Detectives ask for public's help to find wanted man
LISTEN: WA Police release triple-0 call from shooting murder of bikie boss Nick Martin at Kwinana Motorplex
Police pursuit comes to crashing end in East Rockingham
Tensions boil over in Rockingham council chambers as motion to reinstate weekly red bin collections is defeated
WA's first public National War & Service Animal Day commemoration to be held at Dawesville War Memorial
New road safety laws to be named in memory of Furnissdale hit-and-run victim
UK nuclear submarine docks at Rockingham's HMAS Stirling