A large urban and suburban region of Ontario, Canada at the western end of Lake Ontario. It stretches from Niagara Falls, Ontario around to Oshawa, incorporating St. Catharines, Hamilton, Mississauga, and Toronto, as well as their adjacent areas. At present, it is home to approximately 7.5 million people. It is the most populated and prosperous area in Canada, which is the source of the "golden" part of its name.
905 is the area code for the Golden Horseshoe (outside of Toronto, with the area code 416).