With Florida being a peninsula and water on three sides of it, the St. Johns River that runs north (uphill) and the Hillsborough River running through Tampa Bay, plus Lake Okeechobee, numerous lakes and springs, Florida is the place for water!
Manatees have ventured into the springs to keep warm at Blue Spring State Park in Orange City, Florida. The large dark lumps in the water are manatees, aka Sea Cows.
The lumps in the water are the Manatees coming up for air which they do every 20 minutes or less. They are large marine mammals known as sea cows.