Eglinton Avenue in the context of "Toronto subway"

Allen Road, formally known as William R. Allen Road, is a short municipal expressway and arterial road in Toronto, Ontario, Canada. It starts as a controlled-access expressway at Eglinton Avenue West, heading north to just south of Transit Road, then continues as an arterial road north to Kennard Avenue, where it continues as Dufferin Street. Allen Road is named after Metro Toronto chairman William R. Allen and is maintained by the City of Toronto. Landmarks along the road include the Lawrence Heights housing project, Yorkdale Shopping Centre and Downsview Park, and Downsview Airport. A section of the Line 1 Yonge–University subway is located within the median of the expressway from Eglinton Avenue to north of Wilson Avenue.

The portion south of Transit Road was originally constructed as part of the Spadina Expressway project. The Spadina was proposed in the 1950s as a north–south freeway, intended to connect downtown Toronto to the suburbs of North York and to serve the Yorkdale Shopping Centre project; it was only partially built before being cancelled in 1971 due to public opposition. Initially proposed in the 1950s as part of a network of freeways surrounding Toronto, its cancellation in 1971 ended proposals for other proposed expressways into and around Metro Toronto. Despite this, extensions were opened south to Eglinton in 1976 and north to Kennard Avenue in 1982.

The geography of Toronto, Ontario, covers an area of 630 km (240 sq mi) and is bounded by Lake Ontario to the south; Etobicoke Creek, Eglinton Avenue, and Highway 427 to the west; Steeles Avenue to the north; and the Rouge River and the Scarborough–Pickering Townline to the east. In addition to Etobicoke Creek and the Rouge River, the city is trisected by two minor rivers and their tributaries, the Humber River in the west end and the Don River east of downtown. Both flow southward to Lake Ontario at Humber Bay and Toronto Harbour respectively, which are part of the longer Waterfront, as well as Etobicoke Creek and the Rouge River.

The concentration and protection of Toronto's many deep ravines allows for large tracts of densely forested valleys with recreational trails within the city. Approximately 26 to 28 percent of Toronto is covered with over ten million trees, a fairly high percentage within a large city in North America and there are ambitious proposals to double the coverage. Some parts of Toronto, such as High Park, Swansea and the lower Humber River, are located in the northernmost reaches of the Carolinian forest zone found in North America.