 It is bounded on the north by Steeles Avenue East, on the east by the Pickering Town Line and the Rouge River, on the south by Lake Ontario, and on the west by Port Union Road, Kingston Road, Highway 401, Morningside Avenue, Finch Avenue East, and Markham Road.It is one of the largest neighbourhoods officially recognized by the City of Toronto, and is dominated by the Rouge River, its tributaries, and associated wilderness areas.North of Sheppard Avenue the neighbourhood has a strong suburban quality, with seventy-four percent of households single-family residences.