 Florida mangrove plant communities covered an estimated 430,000 to 540,000 acres (1,700 to 2,200 km2) in Florida in 1981.Ninety percent of the Florida mangroves are in southern Florida, in Collier, Lee, Miami-Dade and Monroe Counties.Approximately 280,000 acres (1,100 km2) of mangrove forests are in the hands of the Federal, State and local governments, and of private, non-profit organizations.