Cornwall is the most easterly city in Ontario and is the seat of the United Counties of Stormont, Dundas and Glengarry. It sits on the banks of the St. Lawrence River and lies on the route connecting Canada and the US by way of one of the border crossings. It is also one of the cities of the Quebec City-Windsor Corridor, which is a very highly industrialized area of the country with the densest population.
You can access this city directly from Highway 401. It is about 100 km.