Miami is a city located on the Atlantic coast in southeastern Florida and the county seat of Miami-Dade County, the most populous county in Florida and the eighth-most populous county in the United States with a population of 2,500,625. Downtown Miami and South Florida are home to the largest concentration of international banks in the United States, and is home to many large companies both nationally and internationally. Miami and its suburbs are located on a broad plain between the Florida Everglades to the west and Biscayne Bay to the east that also extends from Florida Bay north to Lake Okeechobee. The surface bedrock under the Miami area is called Miami oolite or Miami limestone. This bedrock is covered by a thin layer of soil, and is no more than 50 feet (15 m) thick. Miami limestone formed as the result of the drastic changes in sea level associated with recent glaciations or ice ages.
By the way - Florida capital is Tallahassee not Miami.