The more than 1,200 miles of shores in the southern U.S. that line the Gulf of Mexico are no stranger to strong storms -- but that doesn't make potential damage from an approaching cyclone any less likely.

As Hurricane Ian marches closer to the U.S., its aim toward the Gulf Coast is especially concerning considering how vulnerable the region is to storm surge, experts told ABC News.

The underwater geology of the Gulf of Mexico is what makes the Gulf Coast particularly unguarded against the massive influx of seawater. The shallow waters in the Gulf, combined with the symmetry of its shallow ocean floor, are what allow the storm surge to be pushed even higher onto land, Ryan Truchelut, chief meteorologist at Weather Tiger, a consulting and risk management firm, told ABC News.

The continental shelf of the Florida Gulf Coast extends quite far offshore -- up to 200 miles in some spots, Truchelut said.

"The waters of the Gulf of Mexico just simply aren't that deep, over a lot of the Florida coastal waters just offshore," he said. "If there's wind pushing water toward that direction, it's shallow, it has nowhere to go. So it kind of amplifies and goes further inland."

MORE: Hurricane Ian's latest path: Expected to be Category 3 by Monday night

Meteorologists are most concerned about the west coast of Florida, starting in the Florida Keys and north to Tampa Bay, Michael Brennan, acting deputy director for the National Hurricane Center, told ABC News.