Biscayne Bay (Spanish: Bahía Vizcaína) 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.

Key Biscayne is an island town in Miami-Dade County, Florida, United States.The population was 12,344 at the 2010 census (on July 1, 2019 population was estimated as 12,846).. Key Biscayne lies south of Miami Beach and east of Miami.The village is connected to Miami via the Rickenbacker Causeway, originally built in 1947.Because of its low elevation and direct …