Greater Toronto Area
The GTA consist of 25 municipalities, including the City of Toronto and 4 regions. The total area of the GTA is 7,000 Sq. Km. or 2,300 sq. miles.
As the city of Toronto has grown outward from its approximate origins in what is today's Downtown Core, the Greater in Greater Toronto Area, or GTA for short, the definition of what the boundaries are, and what is or isn't the GTA has also grown.
Before Toronto's last Amalgamation in 1997, the Old City of Toronto made up the Toronto in GTA while the inner suburbs of Etobicoke, City of York, North York, Scarborough and/or the borough of East York made up the Greater.