The Miami-Dade Zoological Park and Gardens, branded and commonly known as Zoo Miami, formerly known as Miami MetroZoo, is the largest and oldest zoological garden in Florida, and the only tropical zoo in the United States. It is located on the old Richmond Naval Air Station site, southwest of Miami in southern metropolitan Miami-Dade County, in the center of the census-designated places of Three Lakes (north), South Miami Heights (south), Palmetto Estates (east) and Richmond West (west). It houses over 2,000 animals on 740 acres (299 ha), 324 acres (131 ha) of which are developed.