Route 170 is a major east/west highway on the north shore of the St. Lawrence River in Quebec, Canada, and it parallels the Saguenay River on the south side of it. The western terminus of Route 170 is in Métabetchouan–Lac-à-la-Croix at the junction of Route 169, at Lac Saint-Jean, and the eastern terminus is in Saint-Siméon, at the junction of Route 138, close to the Saint Lawrence River.