Welcome to The EmeraldBay at Key Colony, a world class residential condominium community located on idyllic Key Biscayne, Florida. The Key, with its beautiful beaches and easy lifestyle. is a barrier island on the Atlantic, just from 18 miles from Miami International Airport and just minutes away from exciting Miami and Miami Beach. The Key is linked to the mainland by a 7 mile causeway across the glimmering waters of Florida Bay giving us a sense of being faraway and in another time.