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Three dead after boat capsizes off Sydney

Three men have died after their boat capsized off Sydney's southern coastline.

Emergency services were called to Henry Head Lane at La Perouse about 12.30pm on Sunday following reports a boat had capsized near the lighthouse.

Three men - who have not been formally identified - were retrieved from the water but couldn't be revived.

"Once we got the first two people on board, we were unaware there was a third person," Westpac Life Saver Helicopter crewman Clayton Allison told Nine News.

"Given that we had two critically ill people on board the aircraft, we made a decision to return to the base where we could commence resuscitation."

A second helicopter retrieved the third man.

Authorities continued to search nearby waters but it is not believed any other occupants were on board.

"It goes to show how quickly a situation can change - it is an absolutely disastrous way to end a weekend," NSW Ambulance duty operations manager Geoff Senior said.

"There are going to be grieving families after (the) tragedy and our hearts go out to them."

In a separate boating accident, a 40-year-old woman died on the Murray River in the state's south on Sunday afternoon.

A man and three children were rescued after the boat struck a submerged tree and capsized.

The woman's body was discovered about an hour later.

© AAP 2020