The route ends at the Canadian border at the Thousand Islands Bridge , where it crosses the St. Lawrence River , continuing as a short connector , Highway 137 , which crosses the Thousand Islands Parkway before ending at Highway 401 .
The route ends at the Canadian border at the Thousand Islands Bridge , where it crosses the St. Lawrence River , continuing as a short connector , Highway 137 , which serves the Thousand Islands Parkway and Highway 401 .