The Atlantic Coastal Ridge is a geomorphological feature paralleling the Atlantic coast of Florida from the border with Georgia to Miami-Dade County, where it transitions into the Miami Rock Ridge. For most of its length it consists of one or more relict beach ridges created when the sea level was about 30 feet (9.1 m) higher than at present. The southernmost part of the Atlantic Coastal Ridge (the Miami Rock Ridge) was created as a carbonate platform during the same period. Before human modification for agriculture and urban development, much of the ridge hosted scrub vegetation.