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What’s the name of the (mostly) underwater national park at the northern end of the Florida Keys?

Retry Correct Incorrect Biscayne Park’s main purpose is to preserve Biscayne Bay and its offshore barrier reefs — all of which are underwater. In fact, 95 percent of the park’s area is underwater, and it encompasses four distinct ecosystems.

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Nicole Ellis/The Washington Post via Getty Images

Nicole Ellis/The Washington Post via Getty Images

What’s the name of the (mostly) underwater national park at the northern end of the Florida Keys?

• Dry Tortugas National Park
• Big Cypress National Preserve
• Everglades National Park
• Biscayne National Park