The Miami Seaquarium is a 38-acre (15 ha) oceanarium located on the island of Virginia Key in Biscayne Bay, Miami-Dade County, Florida, United States and is located near downtown Miami. Founded in 1955, it is one of the oldest oceanariums in the United States. In addition to marine mammals, the Miami Seaquarium houses fish, sharks, sea turtles, birds, reptiles, and manatees.