Moses-Saunders Power Dam

Maple Grove is an underwater ghost town in the Canadian province of Ontario. It is one of Ontario's Lost Villages, which were permanently flooded by the creation of the St. Lawrence Seaway in 1958. Families and businesses in Maple Grove were moved by Ontario Hydro to the new town of Long Sault before the seaway construction commenced. On August 10, 1954, prime minister Louis St. Laurent, premier Leslie Frost and various U.S. officials turned the first shovelful of earth in Maple Grove. Jeremiah French came from Vermont and arrived at Maple Grove in 1784. He started out with nothing more than a tiny settlers' cottage which over time expanded into a huge flour and saw mills operation.

The Grasse River or Grass River (per 1905 decision of the U.S. Board on Geographic Names) is a 73-mile-long (117 km) river in northern New York, in the United States. The river mainly flows northeast from the foothills of the Adirondack Mountains into the St. Lawrence Valley, making up what is known as the greater St. Lawrence River Drainage Basin along with other tributaries such as the Oswegatchie and Raquette rivers. The river was named after François Joseph Paul, comte de Grasse, a French admiral and hero of the American Revolutionary War. He defeated British forces in the Battle of the Chesapeake, contributing to their surrender at Yorktown, ending the war.

The Cornwall Canal was built by the British government of Canada to bypass a troublesome rapids hindering navigation on the St. Lawrence at Cornwall, Ontario. Construction began in 1834 and was completed in 1843.

Mille Roches is an underwater ghost town in the Canadian province of Ontario. It is one of Ontario's Lost Villages, which were permanently flooded by the creation of the St. Lawrence Seaway in 1958. Families and businesses in Mille Roches were moved to the new town of Long Sault before the seaway construction commenced. Mille Roches was the birthplace of Levi Addison Ault, born into a well-known and established family in the town, who moved to Cincinnati, Ohio as an adult and became a successful businessman and the city's commissioner of parks in the early 1900s. Ault also donated a large parcel of family-owned land on Sheek's Island, which became Ault Park.

The Cornwall Motor Speedway is a 1/4 mile dirt track near the community of Cornwall, Ontario, Canada. It is located northwest of the city on Cornwall Centre Road. The track opened in 1970 and runs weekly racing on Sunday evenings. Weekly race classes include modified, sportsman, pro stock, semi pro and mini stock. Yearly special event shows feature the Big Block Modifieds, sprint cars and late models.

General Vanier Secondary School (GVIS) was a public intermediate school located in Cornwall, Ontario, Canada. Due to a decline in student enrollment, the school was closed in the fall of 2011 and its students transferred to Cornwall Collegiate and Vocational School (CCVS). The Catholic high school St. Joseph's Secondary School (SJSS) is attached and continues to share the school grounds.

St. Joseph's Secondary School (SJSS) or St. Joseph's Catholic Secondary School (SJCSS) is a separate (publicly funded Catholic) secondary school in Cornwall, Ontario, Canada. Falling under the jurisdiction of the Catholic District School Board of Eastern Ontario, it shares its building with the newly amalgamated Sacred Heart Catholic School and grade 7-8 wing (where General Vanier Intermediate School was previously housed). Additionally, Ahkwesasne Mohawk Board of Education (AMBE), which operates schools on the Canadian portion of Akwesasne, has a tuition agreement to send high school students to this school.

The Seaway International Bridge is an international crossing connecting the U.S. state of New York, Akwesasne Mohawk Territory, and the Canadian province of Ontario. It consists of the South and North Channel Bridges. The South Channel Bridge was opened in 1958, and spans the St. Lawrence Seaway. The North Channel Bridge, opened in 2014, connects the City of Cornwall in Ontario to Cornwall Island in Akwesasne Mohawk Territory. The bridge is among the busiest on the Canada–United States border in the state of New York, with about two million crossings a year. It is jointly owned by the Federal Bridge Corporation (a Crown corporation of the Canadian federal government) and the Great Lakes St. Lawrence Seaway Development Corporation (an agency of the United States Department of Transportation), and is operated by the Seaway International Bridge Corporation, which came under the control of the Federal Bridge Corporation from the Saint Lawrence Seaway Authority in 1998. Previously known as the Cornwall-Massena International Bridge, the SIBC was a private bridge whose outstanding stock was purchased by the Saint Lawrence Seaway Authority (Canada) and the Saint Lawrence Seaway Development Corporation (U.S.) in 1957. It was incorporated in Canada five years later. In 2000, the international border crossing that the Seaway International Bridge comprises was named the Three Nations Crossing, in recognition that it connects the Akwesasne Mohawk Territory, a self-governing nation, to the United States and Canada. On January 24, 2014, the opening of a new lower-level bridge marked the official closing of the former high-level North Channel crossing of the Seaway International Bridge. This project was estimated to cost $75 million, entirely funded by the Government of Canada. It was announced in 2010 that the Government of Canada would be going forward with this project that would involve the construction of a new low-level bridge as well as the demolition of the Seaway International Bridge to ensure the longevity of the border crossing, assuring that the former bridge was still in safe driving condition. The high-level Seaway International Bridge was completely demolished in 2015. At the opening ceremony of the new bridge, the first person to make the crossing was Raymonde Champagne, who had also been the first person to cross the high-level bridge in 1962.

Sheek Island is an island in the St. Lawrence River in the Canadian province of Ontario. It is considered to be one of Ontario's Lost Villages, which were permanently flooded by the creation of the St. Lawrence Seaway in 1958. While much of the island has been flooded, a portion of it remains above water, but is not populated. Sheek Island was occupied primarily by family farms and recreational properties. In 1914, Levi Addison Ault donated a family property on the island to the Township of Cornwall, which became Ault Park. After the island was flooded by the Seaway project, Ault Park was rebuilt on the new shoreline near Long Sault. From 1956 to 1958, archaeologists conducted excavations in Ault Park, and believed that they may have found remnants of a 3500-year old native village. The University of Toronto petitioned for an injunction against the Seaway project so that the excavations could continue, but were not successful. A number of artifacts were taken from the site for further study.

Robert Moses State Park – Thousand Islands is a 2,322-acre (9.40 km2) state park located on Barnhart Island in the Saint Lawrence River and the adjacent mainland in the Town of Massena in St. Lawrence County, New York. The park is north of the Village of Massena, near the Canada–US border. The park is named after former New York Parks Commissioner Robert Moses, who created many of the state parks in New York. It is one of two state parks in New York to bear his name. The other, Robert Moses State Park - Long Island, is in southern New York on Fire Island.

The Three Nations Crossing is a border crossing on the Canada–US border, connecting the city of Cornwall, Ontario in Canada to Massena, New York, in the United States. The crossing is associated with the Seaway International Bridge, which crosses the two channels on each side of Cornwall Island, which is located on the St. Lawrence River. The bridge is 4.7 km (2.9 mi) in length.

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. Cornwall is named after the English Duchy of Cornwall; the city's coat of arms is based on that of the duchy with its colours reversed and the addition of a "royal tressure," a Scottish symbol of royalty. It is the urban centre for the surrounding communities of Long Sault and Ingleside to the west; the Mohawk Territory of Akwesasne to the south; St. Andrews West and Avonmore to the north; and Glen Walter, Martintown, Apple Hill, Williamstown, and Lancaster to the east. The city straddles the St. Lawrence River and is home to the St. Lawrence Seaway Management Corporation, which oversees navigation and shipping activities for the St. Lawrence Seaway. It lies within the Quebec City–Windsor Corridor along Ontario Highway 401, is a major port of entry from the United States into Canada, and is positioned to support some of Cornwall's largest industries, which include logistics, distribution, and call centres.