Florida is building a detention facility for migrants nicknamed “Alligator Alcatraz,” turning an abandoned airfield in the Everglades into the newest — and scariest-sounding — holding center designed to help the Trump administration carry out its immigration crackdown.

The remote facility, comprised of large tents, and other planned facilities will cost the state around $450 million a year to run, but Florida can request some reimbursement from the Federal Emergency Management Agency, said Tricia McLaughlin, a spokeswoman for the Department of Homeland Security.

Florida’s attorney general, James Uthmeier, a Trump ally who has pushed to build the detention center in the Everglades, has said the state will not need to invest much in security because the area is surrounded by dangerous wildlife, including alligators and pythons.

The project is sure to appeal to President Trump, who talked repeatedly during his first term about building a moat along the southern border filled with alligators or snakes. As he pushed for a wall to keep migrants out, he urged officials to build it with spikes, razor wire and black paint to ensure that it would serve as a deterrent, the more terrifying-looking the better.

And since resuming office this year, Mr. Trump has already sent migrants to Guantánamo Bay, the symbol for America’s worst enemies, and to a megaprison in El Salvador.