Dozens of volunteers took part in the search and rescue operation. Picture Facebook

A 23-year-old woman has been found alive and well in the Waterfall area on the fourth day of a multi-agency search and rescue operation in rain and windy conditions.

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Dozens of volunteers from the Rural Fire Service, SES and VRA Rescue NSW joined police, NSW Ambulance and National Parks and Wildlife officers in the operation in an area which included dense and remote bushland.

The woman, an international student, was reported missing after last being seen in Dulwich Hill on Sunday May 24. .

Search crews at the RFS Waterfall station, which was the command and communications centre. Picture Facebook

A police statement on Thursday May 28 said they held concerns for her welfare, and inquiries had revealed she may be in the Waterfall area.

Waterfall RFS station became a command and communications centre for crews who began searching the area.

RFS Waterfall brigade said the missing student was found alive and well on Saturday afternoon "in the vicinity of the Waterfall".

"We thank local Waterfall volunteer members for dedicating their time providing facilities and resources supporting the operation," the brigade posted.

"Considering extremely rainy and gusty weather over the last few days, her condition was relatively well and she is expected for a full recovery.

A police helicopter involved in the operation. Picture Facebook

"Dense and remote bushland with varying terrain and extreme weather conditions have made searching efforts difficult for crews on the ground, made up of mostly volunteers.

"Regardless, well over 200km (including all agencies over 4 days) of walking distance have been covered and thoroughly searched for our person of interest.

"We thank local Waterfall members for dedicating their time providing facilities and resources supporting the operation.

"Considering extremely rainy and gusty weather over the last few days, her condition was relatively well and she is expected for a full recovery."