Key Largo is an island in the upper Florida Keys archipelago and, at 33 miles (53 km) long, the largest of the Keys. It is also the northernmost of the Florida Keys in Monroe County, and the northernmost of the Keys connected by U.S. Highway 1 (the Overseas Highway). Its earlier Spanish name was Cayo Largo, meaning Long Key.
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. The water is very warm and clear. Key Largo's proximity to the Everglades also makes it a premier destination for kayakers and ecotourists.