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UPDATE 7-After Hurricane Ian's deadly wrath, Florida, Carolinas begin recovery

(Adds quotes, color from Sanibel Island city manager)

By Brad Brooks and Jonathan Drake

FORT MYERS, Fla./CHARLESTON, S.C., Oct 1 (Reuters) - F lorida and the Carolinas, staggered by one of the fiercest storms in U.S. history, faced a massive recovery on Saturday as remnants of Hurricane Ian threatened further flooding along the Eastern Seaboard while leaving tens of billions of dollars in damage in its wake.

The number of confirmed fatalities from Ian rose to at least 50, most in Lee County, Florida, which bore the brunt of the storm when it slammed ashore on the state's Gulf Coast on Wednesday as a Category 4 hurricane packing maximum sustained winds of 150 miles (240 km) per hour.

The death toll was expected to climb as floodwaters receded and search teams reached more areas initially cut off by the storm.

As of Friday, some 10,000 people were reported unaccounted for in Florida, according to the state's emergency management director, who added that many of those were likely safe in shelters or otherwise unreachable because of power and phone outages.

As the full extent of devastation came into clearer focus three days after Ian made U.S. landfall, officials said some of the heaviest damage appeared to have been inflicted by raging wind-driven ocean surf that rushed into seaside communities and washed buildings away.

New satellite images from the National Oceanic and Atmospheric Administration (NOAA) showed beach cottages and a motel building that lined the shores of Florida's Sanibel Island had been demolished by Ian's storm surge. Although most homes appeared to still be standing, roof damage to all was evident.

Surveys from the ground showed that the barrier island, a popular tourist getaway that was home to some 6,000 residents, was left utterly ravaged, from its infrastructure to its famously idyllic aesthetic character.

"It's all just completely gone," Sanibel's city manager, Dana Souza, said. "Our electric system is pretty much destroyed, our sewer system has been damaged badly and our public water supply is under assessment."

The island's link to the mainland was severed by breaches to Sanibel's causeway bridge, further complicating recovery efforts, Souza said.

After waning to a tropical storm by the end of its march across Florida to the Atlantic, Ian regained hurricane strength and pummeled coastal South Carolina on Friday, sweeping ashore near Georgetown, north of the historic port city of Charleston, with sustained winds reaching 85 mph (140 kph).

Numerous roads were flooded and blocked by fallen trees while a number of piers were damaged in that area.