Key Largo National Marine Sanctuary

Key Largo (Spanish: Cayo Largo) is an island in the upper Florida Keys archipelago and is the largest section of the keys, at 33 miles (53 km) long. It is one of the northernmost of the Florida Keys in Monroe County, and the northernmost of the keys connected by U.S. Highway 1 (the Overseas Highway). Three census-designated places are on the island of Key Largo: North Key Largo, near the Card Sound Bridge, Key Largo, eight to nine miles from the southern end of the island, and Tavernier, at the southern end of the island. As of 2010, the three places have a combined population of 13,850. None of Key Largo is an incorporated municipality, so it is governed at the local level by Monroe County. Key Largo is connected to the mainland in Miami-Dade County by two routes. The first route is the Overseas Highway, the southernmost portion of U.S. Highway 1, which enters Key Largo at Jewfish Creek near the middle of the island and turns southwest. The second route is Card Sound Road, which connects to the northern part of Key Largo at Card Sound Bridge and runs southeastward to connect with County Road 905, which runs southwest and joins U.S. 1 at about mile marker 106. These routes originate at Florida City on the mainland. Key Largo is a popular tourist destination and calls itself the "Diving Capital of the World" because the living coral reef a few miles offshore attracts thousands of scuba divers and sport-fishing enthusiasts.Key Largo's proximity to the Everglades also makes it a premier destination for kayakers and ecotourists. Automotive and highway pioneer and Miami Beach developer Carl G. Fisher built the Caribbean Club in 1938 as his last project. Key Largo is situated between Everglades National Park to the northwest and John Pennekamp Coral Reef State Park to the east, the first underwater park in the United States, which protects part of the Florida Reef, the only living coral barrier reef in the continental United States.

African Queen (also known as S/L Livingstone) was the name of two boats used in the 1951 movie The African Queen starring Humprey Bogart and Katharine Hepburn. It was filmed in the Belgian Congo on a tributary of the Congo River, and on the Nile in the Murchison Falls National Park in Uganda. Two boats were utilised, one in each location. One of the boats is now located in Key Largo, Florida and on February 18, 1992, was added to the U.S. National Register of Historic Places. The other is located in Jinja, Uganda.

Rock Harbor is an unincorporated community in Monroe County, Florida, United States, located in the upper Florida Keys on Key Largo on US 1 (the Overseas Highway) northeast of Thompson and southwest of the census-designated place of Key Largo.

The Port Largo Seaplane Base (IATA: KYL) is a sea plane base located 2 miles (3.2 km) southwest of Key Largo in Monroe County, Florida, United States.

Key Largo is an unincorporated area and census-designated place in Monroe County, Florida, United States, located on the island of Key Largo in the upper Florida Keys. The population was 12,447 at the 2020 census, up from 10,433 in 2010. The name comes from the Spanish Cayo Largo, or "long key". It is both the first island and town of the Florida Keys to be reached from the Overseas Highway to Key West. It was also the location of one of the stations of the Overseas Railroad.

Rodriguez Key is an uninhabited island in the upper Florida Keys. It is located east of Key Largo. The island is covered by mangrove forests, including the species Rhizophora mangle, Avicennia nitida, and Laguncularia racemosa.

The Florida Reef (also known as the Great Florida Reef, Florida reefs, Florida Reef Tract and Florida Keys Reef Tract) is the only living coral barrier reef in the continental United States. It lies a few miles seaward of the Florida Keys, is about 4 miles (6 to 7 km) wide and extends (along the 20 meter depth contour) 270 km (170 mi) from Fowey Rocks just east of Soldier Key to just south of the Marquesas Keys. The barrier reef tract forms a great arc, concentric with the Florida Keys, with the northern end, in Biscayne National Park, oriented north-south and the western end, south of the Marquesas Keys, oriented east-west. The rest of the reef outside Biscayne National Park lies within John Pennekamp Coral Reef State Park and the Florida Keys National Marine Sanctuary. Isolated coral patch reefs occur northward from Biscayne National Park as far north as Stuart, in Martin County. Coral reefs are also found in Dry Tortugas National Park west of the Marquesas Keys. There are more than 6,000 individual reefs in the system. The reefs are 5,000 to 7,000 years old, having developed since sea levels rose following the Wisconsinan glaciation.The densest and most spectacular reefs, along with the highest water clarity, are found to the seaward of Key Largo (in and beyond John Pennekamp Coral Reef State Park) and Elliott Key (the northernmost 'true' Florida Key) where the two long keys help protect the reefs from the effects of water exchange with Florida Bay, Biscayne Bay, Card Sound and Barnes Sound. The bays and sounds (all between the Florida Keys and the mainland) tend to have lower salinity, higher turbidity and wider temperature variations than the water in the open ocean. Channels between the Keys allow brackish water from the bays to flow onto the reefs (especially in the middle Keys), limiting their growth.

John Pennekamp Coral Reef State Park is a Florida State Park located on Key Largo in Florida. It includes approximately 70 nautical square miles (240 km²) of adjacent Atlantic Ocean waters. The park is approximately 25 miles in length and extends 3 miles into the Atlantic Ocean. It was the first underwater park in the United States. The park was added to the National Register of Historic Places on April 14, 1972. The primary attractions of the park are the coral reefs (such as Molasses Reef) and their associated marine life. In Fiscal Year 2004 the park had more than a million visitors, making it the most popular park in the Florida State Parks system. The Florida Keys and the Flower Garden Banks in the Gulf of Mexico off the Texas coast are the only living coral reef formations in the continental United States.

The Rock Mound Archeological Site is an archaeological site in Key Largo, Florida. It is located a half mile west of U.S. 1. On July 1, 1975, it was added to the U.S. National Register of Historic Places.

Caribbean Club on Key Largo, northernmost of the Florida Keys, was developed and built by auto parts and real estate promoter Carl Graham Fisher in 1938. Carl Fisher, considered a genius as a promoter, had conceived the Lincoln Highway, the first road across America, in 1913. Fisher had helped develop the Indianapolis Motor Speedway and Miami Beach and had at one time been worth an estimated $100 million. He lost his fortune in the Stock Market Crash of 1929 and the Great Depression. One source indicates that during the years before his death, Fisher was living in a modest cottage on Miami Beach.His last project was the development of the Caribbean Club on Key Largo as a fishing club for men who were far from wealthy. Eight years after his death, the Caribbean Club became famous as a purported "on location" filming site for the 1948 film Key Largo starring Humphrey Bogart and Lauren Bacall. In fact, only that film's initial exterior shots were filmed in the Florida Keys, and the rest was filmed in the Warner Bros. studio. After Fisher's death, the club was turned into a casino. In 1990, the Orlando Sentinel reviewed the sources of the rumours about the filming of "Key Largo" in an article titled "Who Cares if Bogie and Bacall Never Set Foot Here". At that time, the property was described as a motel with "modest rooms and cottages". By 1948, the property was owned by the Krone family in 1948; it was extensively damaged by fire in 1955 and it was rebuilt in a different style. The Caribbean Club was acquired by Ruth and Lefty Whitehurst in 1963; fire again caused damage in 1971 and repairs were completed. As of 2021, the business was operated by the couple's children and grandchildren. The family's website was reporting that exterior shots for "Key Largo" were filmed here.

Key Largo School, located on mile marker 105, is a public K-8 school in Key Largo, Florida, within the Monroe County School District. KLS was designated a Blue Ribbon School of Excellence under principal Frankie St. James., and is listed as one of the Top 50 Schools in the State of Florida. Grade levels are K through 8th Grade and are headed by Principal Darren Pais. As of 2006, KLS had 995 students. Their mascot is the Tornado and their school colors are Blue and Gold. The school was designated an AVID National Demonstration School under principal Laura Lietaert in 2019 signifying it as a model school and one of the top AVID schools in the nation. The school officially opened in 1972 after being scheduled to open in 1971. Businesses in the Key Largo community housed different grade level groups of students from August until January when the new building was ready to open its doors. In 2008, the original elementary school building was demolished and a new building that would fit all grades K-8 was constructed. The old middle school building now accommodates electives.

Snapper Ledge is a small coral reef located within the Florida Keys National Marine Sanctuary. It lies to the southeast of Key Largo, to the south the Key Largo Existing Management Area and John Pennekamp Coral Reef State Park. Unlike many reefs within the Sanctuary, this reef is not within a Sanctuary Preservation Area (SPA). It is near Pickles Reef. Since 2009, the Coral Restoration Foundation has used Snapper Ledge as a nursery site to grow Elkhorn coral (Acropora palmata).