Eglinton Avenue is a major east–west arterial thoroughfare in Toronto and Mississauga in the Canadian province of Ontario. The street begins at Highway 407 (but does not interchange with the tollway) at the western limits of Mississauga, as a continuation of Lower Baseline in Milton. It traverses the midsection of both cities and ends at Kingston Road. Eglinton Avenue is the only street to cross all six former boroughs of Metropolitan Toronto. The Toronto section was surveyed in the 19th century as the Fourth Concession Road (with the first being Queen Street). It was historically known as Richview Sideroad in Etobicoke and Lower Baseline in Mississauga. It was also designated Highway 5A (and later Highway 109) in Scarborough.
