Ontario populated places on the Saint Lawrence River

Kingston is a city in Ontario, Canada, on the northeastern end of Lake Ontario. It is at the beginning of the St. Lawrence River and at the mouth of the Cataraqui River, the south end of the Rideau Canal. Kingston is near the Thousand Islands, a tourist region to the east, and the Prince Edward County tourist region to the west. Kingston is nicknamed the "Limestone City" because it has many heritage buildings constructed using local limestone.

Leeds and the Thousand Islands is a township in the Canadian province of Ontario, located within the United Counties of Leeds and Grenville. The township is located along the Saint Lawrence River, and extends north into rural hamlets and villages. Formerly, this township was divided into three separate townships: Leeds, Lansdowne, and Escott townships; these townships amalgamated to form the current township of Leeds and the Thousand Islands.

South Stormont is a township in eastern Ontario, Canada, in the United Counties of Stormont, Dundas and Glengarry. It is located 53 kilometres (33 mi) southeast of Ottawa. South Stormont borders on, but does not include, the city of Cornwall.

Cornwall is a city in Eastern Ontario, Canada. Situated where the provinces of Ontario and Quebec and the U.S. state of New York converge. It is the seat of the United Counties of Stormont, Dundas, and Glengarry and is Ontario's easternmost city.

Edwardsburgh/Cardinal is a township in the United Counties of Leeds and Grenville of eastern Ontario, Canada. Edwardsburgh township was first surveyed in 1783, and incorporated in 1850. The township was part of the historical Grenville County before it merged with Leeds County to form the United Counties in the 19th century.

Morrisburg is an unincorporated community in the Municipality of South Dundas, located in Eastern Ontario, Canada. The population was 2,398 at the 2021 census.

Edwardsburgh/Cardinal is a township in the United Counties of Leeds and Grenville of eastern Ontario, Canada. Edwardsburgh township was first surveyed in 1783, and incorporated in 1850. The township was part of the historical Grenville County before it merged with Leeds County to form the United Counties in the 19th century.

Pointe-Saint-Charles (also known in English as Point Saint Charles, and locally as The Point, or "PSC") is a neighbourhood in the borough of Le Sud-Ouest in the city of Montreal, Quebec, Canada. Historically a working-class area, the creation of many new housing units, the recycling of industrial buildings into business incubators, lofts, and condos, the 2002 re-opening of the canal as a recreation and tourism area, the improvement of public spaces, and heritage enhancement have all helped transform the neighbourhood and attract new residents. Community groups continue to be pro-active in areas related to the fight against poverty and the improvement of living conditions.

Gananoque (GAN-ə-NOK-way) is a town in the Leeds and Grenville area of Ontario, Canada. The town had a population of 5,383 year-round residents in the 2021 Canadian Census, as well as summer residents sometimes referred to as "Islanders" because of the Thousand Islands in the Saint Lawrence River, Gananoque's most important tourist attraction. The Gananoque River flows through the town and the St. Lawrence River serves as the southern boundary of the town.

Brockville, formerly Elizabethtown, is a city in Eastern Ontario, Canada, in the Thousand Islands region. Although it is the seat of the United Counties of Leeds and Grenville, it is politically independent of the county. It is included with Leeds and Grenville for census purposes only.