Metropolitan area
A metropolitan area is a city and its surrounding suburbs.  The word "metropolitan" comes from two Greek language words meaning "mother" and "city". A metropolitan area may be much larger than its inner city, and its suburbs may be smaller towns and villages which are now connected to the larger city as suburbanization has spread. The biggest such metropolitan area is that of Tokyo. 8.5 million people live in Tokyo itself, 36.5 million live in the metropolitan area.