Dickinson's Landing, Ontario

The Lost Villages were ten communities (nine conventional villages and a populated island) in the Canadian province of Ontario, in the former townships of Cornwall and Osnabruck (now South Stormont) near Cornwall, which were permanently submerged by the creation of the Saint Lawrence Seaway in 1958. The flooding was expected and planned for as the result of the Moses-Saunders Power Dam construction, which began in August 1954. In the weeks and months leading up to the inundation, families and businesses in the affected communities were moved to the new planned communities of Long Sault and Ingleside. These negotiations were controversial, however, as many residents of the communities felt that market value compensation was insufficient since the Seaway plan had already depressed property values in the region. The town of Iroquois was also flooded, but was relocated 1.5 kilometres (0.93 mi) north rather than being abandoned. Another community, Morrisburg, was partially submerged as well, but the area to be flooded was moved to higher ground within the same townsite. In all, approximately 6,500 people were displaced by the project, 530 buildings moved, and countless other homes, schools, and businesses demolished. A portion of the provincial Highway 2 in the area was flooded; the highway was rebuilt along a Canadian National Railway right-of-way in the area. At 8 a.m. on 1 July 1958, a large cofferdam was demolished, allowing the flooding to begin. Four days later, all of the former townsites were fully underwater. Parts of the New York shoreline were flooded by the project as well, but no communities were lost on the American side of the river.

Santa Cruz 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 Santa Cruz were moved to the new town of Ingleside before the seaway construction commenced.

Wales is a 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. The town was named for the Prince of Wales (later Edward VII) who visited the area during his Canadian tour of 1860. Wales was built on the land grant of Dr. James Stuart, of the King's Royal Regiment of New York. From 1810 to 1957, five generations of the Stuart family lived on this property. Families and businesses in Wales were moved to the new town of Ingleside before the seaway construction commenced. Wales, about two miles away from the old shoreline, was the only inland town affected by the flooding, as the community was located in a creek valley below the new waterline.

Woodlands 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. The village was founded in 1784 by German-speaking United Empire Loyalist from New York. It had a population of about 70 people at the time of its flooding. It was known, in the 1950s, for the cottages that lined the road adjacent to the then bank of the St Lawrence River. Families and businesses in Woodlands were moved to the new town of Ingleside before the seaway construction commenced.

Long Sault was a rapid in the St. Lawrence River upstream and west of Cornwall, Ontario. Sault is the archaic spelling of the French word saut, meaning rapids. The Long Sault created a navigation barrier along the river for much of its history, motivating the construction of the Moses-Saunders Power Dam, part of the St. Lawrence Seaway, in the 1950s as the size of ships and the volume of shipping traffic along the river began to exceed the capacity of the area's canal locks. The construction required the flooding of a large swath of land near the rapids to facilitate a hydroelectric dam and to make the rapids area more navigable. The flooded region includes Ontario's Lost Villages. The Long Sault Parkway takes its name from the rapids.

Croil Island is a 796-acre (3.22 km2) uninhabited island on the St. Lawrence River in the Town of Louisville in St. Lawrence County, New York, United States. The island is currently occupied by the undeveloped Croil Island State Park.

Farran's Point is an underwater ghost town in the province of Ontario, Canada. 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 Farran's Point were moved to the new town of Ingleside before the seaway construction commenced. The small village is submerged under shallow water; portions of sidewalks and foundations can be seen when the water of the St. Lawrence River is low. It is the birthplace of NHL Hockey Hall of Famer Cy Denneny.

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.

Eastern Ontario (census population 1,892,332 in 2021) (French: Est de l'Ontario) is a secondary region of Southern Ontario in the Canadian province of Ontario. It occupies a wedge-shaped area bounded by the Ottawa River and Quebec to the northeast and east, the St. Lawrence River and New York to the south, and Northern Ontario and Central Ontario to the west and northwest.

The Wiley-Dondero Canal is a section of the St. Lawrence Seaway in New York, United States, with a length of 8 nautical miles (15 km; 9.2 mi). The United States Army Corps of Engineers planned and supervised the Wiley-Dondero Canal to bypass the Long Sault. Actual construction was performed by Peter Kiewit Sons Co., Morrison-Knudsen Co., Perini Corp., Utah Construction Co., and Walsh Construction Co. Located near Massena, New York, the seaway provides a total lift of 83 feet (25 m) from the Eisenhower Lock and the Bertrand H. Snell Lock, which are the two locks in the canal. Originally known as the Long Sault Canal, it was later renamed the Wiley-Dondero Canal. Construction was complicated by the need to avoid interrupting the waterflow to nearby hydroelectric installations.

The Eisenhower Lock is one of the seven canal locks on the St Lawrence River leg of the St Lawrence Seaway. This lock provides a 38 foot lift for ships heading upstream. It is one of two locks located near Massena, New York. The lock was constructed to bypass the portion of the St Lawrence River known as the Long Sault. The US Army Corps of Engineers planned and supervised the construction. Actual construction was performed by Peter Kiewit Sons Co., Morrison-Knudsen Co., Perini Corp., Utah Construction Co., and Walsh Construction Co. The lock was originally named the "Robinson Bay Lock" and was renamed after President Dwight Eisenhower after his term was over. The lock, and the nearby Bertrand H. Snell Lock are part of the Wiley-Dondero Canal. Construction was complicated by the need to not interrupt the waterflow to nearby hydro-electric installations. The St. Lawrence Seaway was dedicated on 26 June 1959 at a ceremony in Montreal. Key speakers were President Dwight Eisenhower and Queen Elizabeth II. The following day there was a second dedication ceremony at the Eisenhower Lock. Key attendees were Queen Elizabeth II, Vice President Richard Nixon and New York Governor Nelson Rockefeller. In 1972 a tanker, the MV Venus, exploded while transiting the lock. On June 18, 2015, the cruise ship Saint Laurent collided with the lock, causing it to be drained, and closed for almost two days.

The Bertrand H. Snell Lock is situated on the St Lawrence River leg of the St Lawrence Seaway and is one of the seven canal locks found along the length of the seaway. The lock has a 45 ft (14 m) lift for ships traveling upstream. It is situated near Massena, New York along with one of the other locks. The lock was constructed parallel to the portion of the St Lawrence River known as the "Long Sault". The US Army Corps of Engineers planned and supervised the construction. Actual construction was performed by Peter Kiewit Sons Co., Morrison-Knudsen Co., Perini Corp., Utah Construction Co., and Walsh Construction Co. The lock was originally named the "Grasse River Lock" and was renamed after Bertrand Snell after his death. The lock, and the nearby Eisenhower Lock are part of the Wiley-Dondero Canal. Construction was complicated by the need to not interrupt the waterflow to nearby hydro-electric installations.