Atlanta metropolitan area had a population of only a few thousand people.
The SI unit of area is the square metre, which is considered an SI derived unit
  The are was the original unit of area in the metric system, with:1 are = 100 square metresThough the are has fallen out of use, the hectare is still commonly used to measure land:1 hectare = 100 ares = 10,000 square metres = 0

