Police are appealing for public help to identify a mystery woman whose body was found in Mundaring Weir last night.
She was discovered floating in the dam about 8.30pm.
The woman is described as 30 to 40 years old and slim with fair skin and light brown shoulder-length hair.
Police are asking anyone with a friend or relative visiting the area who has not returned home or anyone who knows of a woman planning to be in the area in the last 24 to 48 hours to contact Crime Stoppers on 1800 333 000.
Detectives are investigating the circumstances surrounding the woman's death.