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Disney finally fenced off the Seven Seas Lagoon on Friday and posted proper alligator warnings ... nearly 3 days after Lane Graves' tragic death.

Construction workers encircled the lagoon with poles and strung ropes between them on the same shoreline where the 2-year-old was attacked.

"Beach Closed" signs remain up and they've added other signs warning of gators and snakes too.

Walt Disney World Resort Vice President Jacquee Wahler says the new signage is temporary while they work out permanent, long-term solutions.