Elliott Key is the northernmost of the true Florida Keys (those 'keys' which are ancient coral reefs lifted above the present sea level), and the largest key north of Key Largo. It is located entirely within Biscayne National Park, in Miami-Dade County, Florida, east of Homestead, Florida. It is bordered by the Atlantic Ocean to the east, Biscayne Bay to the west, Sands Key (across Sands Cut) to the north and Old Rhodes Key (across Caesar Creek) to the south. Adams Key is just west of the southern end of Elliott Key. Elliott Key is about seven miles (11 km) long. Its maximum width is about 2,500 feet (760 m) near the north end and its average width is less than 2,000 feet (610 m). The higher elevations on the island range from 6 to 8 feet (2.4 m) above sea level and occur generally along an unimproved road that runs longitudinally through the center of the island. The average elevation is about 3 feet (0.91 m) above sea level. The key is accessible only by boat. Elliot Key has a National Park Service campground, but is otherwise uninhabited.