Biscayne Bay, Biscayne National Park

Biscayne Bay is a lagoon, with characteristics of an estuary, located on the Atlantic coast of South Florida, United States. The northern end of the lagoon is surrounded by the densely developed heart of the Miami metropolitan area, while the southern end is largely undeveloped, with a large portion of the lagoon included in Biscayne National Park. Sources differ on the extent of the lagoon. The part of the lagoon that is traditionally called "Biscayne Bay" is approximately 35 miles long and up to 8 miles wide, with a surface area of 573 square kilometres. Various definitions may include Dumfoundling Bay, Card Sound, and Barnes Sound in a larger "Biscayne Bay", which is 60 miles long, with a surface area of about 703 square kilometres. ()