Two teenage girls had to be rescued from the Manukau Harbour after drifting too far on an inflatable swan this morning.

The girls were blown about 1.5km off-shore from the Awhitu Regional Park, in southwest Auckland, and had to be rescued by boat.

And in another incident also this morning, two people were assisted from the water when their inflatable pool toy overturned, near the Bayswater Marina, on Auckland's North Shore in the Waitemata Harbour.

Only one of the two people were wearing a personal floatation device.

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Police are concerned for the safety of people using inflatable water toys.

Sergeant John Saunders of the Police Maritime Unit in Auckland said: "Four people have escaped drowning in two separate incidents on each of Auckland's harbours.

"These are not boats and should not be used outside of a small sheltered swimming pool."