High Quality Content by WIKIPEDIA articles! The Keele Valley Landfill was the largest landfill in Canada and the third largest in North America during its operation. It was the primary landfill site for the City of Toronto and the regional municipalities of York and Durham from 1983 until 2002, and was owned and operated by the City of Toronto. It was located at the intersection of Keele Street and McNaughton Road in Maple, a community in the northeastern part of the City of Vaughan in Ontario.