Occupying 172,000 acres along the southern portion of Biscayne Bay, south of Miami and north of the Florida Keys, Biscayne National Park is 95% submerged, its terrain ranging from 4 feet above sea level to 60 feet below. Contained within are four distinct zones: Biscayne Bay, undeveloped upper Florida Keys, coral reefs, and coastal mangrove forest. Mangroves line mainland shores much as they do elsewhere along South Florida's
protected waters. Biscayne Bay serves as a lobster sanctuary and a nursery for fish, sponges, crabs, and other sea life. Manatees and sea turtles frequent its warm, shallow waters. The park hosts legions of boaters and landlubbers gazing in awe over the bay.