The Indian River Lagoon has been designated an Estuary of National Significance. It has the greatest biodiversity and the largest number of species of any estuary in the United States. One-third of America’s manatees live there, alongside dolphin, mullet and rare seagrasses.
The St. Lucie River estuary anchors the south end of the 156-mile lagoon. It is the lagoon’s main source of fresh water. That wasn’t always so.
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