Cornwall is a city in
eastern Ontario, Canada, and the seat of the
United Counties of Stormont, Dundas and Glengarry. Cornwall is Ontario's easternmost city, located on the
Saint Lawrence River, in the
Quebec City–Windsor Corridor along
Ontario Highway 401, and is the
urban centre for surrounding communities, including
Long Sault and
Ingleside to the west,
Mohawk Territory of
Akwesasne to the south, St. Andrew's and Avonmore to the north, and Glen Walter, Martintown, Williamstown, and Lancaster to the east.