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 connected to the mainland in Miami-Dade County by two routes. The Overseas Highway, which is U.S. Highway 1, enters Key Largo at Jewfish Creek near the middle of the island and turns southwest. Card Sound Road 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.
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