A teenager suffered a seizure on a floating dock off Island Park Thursday afternoon but was saved by her friend and rescuers, authorities said.

The victim, 16, was kept from falling into the water by her friend, another teenage girl, as the seizure took its course more than 50 yards from shore, Island Park fire officials said.

“Her friend kind of stopped her from rolling off into the water,” said First Assistant Fire Chief James Miotto, who directed the rescue. “She kind of held her.

“Thank God she actually had the seizure on the dock and not inside the water.”

Lifeguards from Island Park and Long Beach swam to the dock in Hog Island Channel near Waterford Road to stabilize her after a village employee called 911, officials said.

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Island Park Fire Department divers also swam there with a back board, while Long Beach firefighters arrived on personal watercrafts towing a patient sled and Nassau police marine officers came in their vessel, Miotto said.

“We had an EMS person go out to her and treat her on the dock,” the chief said, “and then we had a couple rescue divers go out there, package her on the back board, put her into the water and float her to shore.”

The teenager was conscious and was dazed but stable, fire officials said. An ambulance brought her to South Nassau Communities Hospital in Oceanside, they said.

About 20 people from at least five agencies helped in the rescue, getting her to shore within 10 minutes of the 911 call, fire officials said. Miotto said Oceanside and Atlantic Beach fire units started to respond but were called off because the incident was under control.

Said Miotto: “It was a good effort by all.”