Ontario Highway 17

King's Highway 17, more commonly known as Highway 17, is a provincially maintained highway and the primary route of the Trans-Canada Highway through the Canadian province of Ontario. It begins at the Manitoba boundary, west of Kenora, and the main section ends where Highway 417 begins just west of Arnprior. A small disconnected signed section of the highway still remains within the Ottawa Region between County Road 29 and Grants Side Road. This makes it Ontario's longest highway, and Canada's second-longest provincial highway, narrowly surpassed by British Columbia Highway 97.

Thunder Bay connections: Schreiber, Ontario; Greenstone, Ontario; Ontario Highway 102; Ontario Highway 11; Lake Superior; Thunder Bay; Thunder Bay Expressway; Lake Nipigon.

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