Police have launched an investigation after a man fell out of a boat and died in Swansea this morning.

About 9.45am (Sunday 2 November 2014), the sole occupant of a vessel, a 45-year-old Edgeworth man, was navigating into the southern entrance of Swan Bay, when he fell from the vessel.

While the man was in the water he was hit by the vessel and sustained serious injuries.

Witnesses in nearby boats assisted the man and took him to Pelican, about 5km south of Belmont, however he died on arrival.

Officers from the Marine Area Command and Lake Macquarie Local Area Command attended and commenced an investigation.

Investigators are appealing for anyone with information about the incident who has not yet spoken to police to contact Crime Stoppers on 1800 333 000.

A report will be prepared for the information of the Coroner.