Saint Lawrence Seaway in the context of "Malaccamax"

Lake Ontario (French: Lac Ontario) is one of the five Great Lakes of North America. It is bounded on the north, west, and southwest by the Canadian province of Ontario, and on the south and east by the U.S. state of New York. The Canada–United States border spans the centre of the lake. On the Canadian side, the major cities are Kingston, Mississauga, Toronto, Hamilton, and St. Catharines. On the American side, the major cities are Rochester and Watertown.

The last in the Great Lakes chain, Lake Ontario serves as the outlet to the Atlantic Ocean via the Saint Lawrence River, comprising the western end of the Saint Lawrence Seaway. Its primary inlet is the Niagara River from Lake Erie. The Long Sault control dam, primarily along with the Moses-Saunders Power Dam regulates the water level of the lake.

The Detroit River is an international river in North America. The river, which forms part of the border between the U.S. state of Michigan and the Canadian province of Ontario, flows west and south for 24 nautical miles (44 km; 28 mi) from Lake St. Clair to Lake Erie as a strait in the Great Lakes system. The river divides the metropolitan areas of Detroit, Michigan, and Windsor, Ontario—an area collectively referred to as Detroit–Windsor. The Ambassador Bridge, the Detroit–Windsor Tunnel, and the Michigan Central Railway Tunnel connect the cities.

The river's English name comes from the French Rivière du Détroit (translated as "River of the Strait"). The Detroit River has served an important role in the history of Detroit and Windsor, and is one of the world's busiest waterways. It is an important transportation route connecting Lake Michigan, Lake Huron, and Lake Superior to Lake Erie and eventually to Lake Ontario, the St. Lawrence Seaway and the Erie Canal. When Detroit underwent rapid industrialization at the turn of the 20th century, the Detroit River became notoriously polluted and toxic. Since the late 20th century, however, a vast restoration effort has been undertaken because of the river's ecological importance.

The Moses-Saunders Power Dam, short for Robert Moses-Robert H. Saunders Power Dam, is a dam on the Saint Lawrence River straddling the border between the United States and Canada. It is located between Massena in New York and Cornwall in Ontario. The dam supplies water to two adjacent hydroelectric power generating stations, the United States' 912 MW St. Lawrence-Franklin D. Roosevelt Power Project, and Canada's 1,045 MW R.H. Saunders Generating Station. Constructed between 1954 and 1958 as part of the larger Saint Lawrence Seaway project, the dam created Lake St. Lawrence. Aside from providing significant amounts of renewable power, the dam regulates the St. Lawrence River and affords passage for the navigation of large vessels. Despite the enormous economic advantages of the dam, it required the relocation of 6,500 people and caused harm to the surrounding environment. Efforts have been made over the years to improve shoreline and fish habitats.

The dam regulates the level of Lake Ontario.

Title 33 of the United States Code outlines the role of navigable waters in the United States Code.

• 33 U.S.C. ch. 1—Navigable Waters Generally
• 33 U.S.C. ch. 2—International Rules for Navigation at Sea
• 33 U.S.C. ch. 3—Navigation Rules for Harbors, Rivers, and Inland Waters Generally
• 33 U.S.C. ch. 4—Navigation Rules for Great Lakes and Their Connecting and Tributary Waters
• 33 U.S.C. ch. 5—Navigation Rules for Red River of the North and Rivers Emptying Into Gulf of Mexico and Tributaries
• 33 U.S.C. ch. 5A—Exemption of Navy Or Coast Guard Vessels from Certain Navigation Rules
• 33 U.S.C. ch. 6—General Duties of Ship Officers and Owners After Collision or Other Accident
• 33 U.S.C. ch. 7—Regulations For the Suppression of Piracy
• 33 U.S.C. ch. 8—Summary Trials For Certain Offenses Against Navigation Laws
• 33 U.S.C. ch. 9—Protection of Navigable Waters and of Harbor and River Improvements Generally
• 33 U.S.C. ch. 10—Anchorage Grounds And Harbor Regulations Generally
• 33 U.S.C. ch. 11—Bridges Over Navigable Waters
• 33 U.S.C. ch. 12—River and Harbor Improvements Generally
• 33 U.S.C. ch. 13—Mississippi River Commission
• 33 U.S.C. ch. 14—California Debris Commission
• 33 U.S.C. ch. 15—Flood Control
• 33 U.S.C. ch. 16—Lighthouses
• 33 U.S.C. ch. 17—National Ocean Survey
• 33 U.S.C. ch. 18—Longshore and Harbor Workers Compensation
• 33 U.S.C. ch. 19—Saint Lawrence Seaway
• 33 U.S.C. ch. 20—Pollution of the Sea by Oil
• 33 U.S.C. ch. 21—International Regulations for Preventing Collisions at Sea
• 33 U.S.C. ch. 22—Sea Grant Colleges and Marine Science Development
• 33 U.S.C. ch. 23—Pollution Control of Navigable Waters
• 33 U.S.C. ch. 24—Vessel Bridge-To-Bridge Communication
• 33 U.S.C. ch. 25—Ports and Waterways Safety Program
• 33 U.S.C. ch. 26—Water Pollution Prevention and Control
• 33 U.S.C. ch. 27—Ocean Dumping
• 33 U.S.C. ch. 28—Pollution Casualties on the High Seas: United States Intervention
• 33 U.S.C. ch. 29—Deepwater Ports
• 33 U.S.C. ch. 30—International Regulations for Preventing Collisions at Sea
• 33 U.S.C. ch. 31—Ocean Pollution Research and Development and Monitoring Planning
• 33 U.S.C. ch. 32—Inland Waterways Trust Fund
• 33 U.S.C. ch. 33—Prevention of Pollution from Ships
• 33 U.S.C. ch. 34—Inland Navigational Rules
• 33 U.S.C. ch. 35—Artificial Reefs
• 33 U.S.C. ch. 36—Water Resources Development
• 33 U.S.C. ch. 37—Organotin Antifouling Paint Control
• 33 U.S.C. ch. 38—Dumping of Medical Waste by Public Vessels
• 33 U.S.C. ch. 39—Shore Protection from Municipal or Commercial Waste
• 33 U.S.C. ch. 40—Oil Pollution
• 33 U.S.C. ch. 41—National Coastal Monitoring
• 33 U.S.C. ch. 42—Estuary Restoration
• 33 U.S.C. ch. 43—National Oceanic and Atmospheric Administration Commissioned Officer Corps
• 33 U.S.C. ch. 44—Oceans and Human Health

The North Country of Upstate New York is the northernmost region of the U.S. state of New York. It is bordered by Lake Champlain to the east and further east to the adjacent state of Vermont and the New England region; the Adirondack Mountains / Adirondack Park and the Upper Capital District with the state capital of Albany to the south; the Mohawk Valley region of New York to the southwest; the Canadian-American international border (with the Province of Ontario in Canada) to the north; and Lake Ontario, (the eastern-most of the Great Lakes) and the Saint Lawrence River / Saint Lawrence Seaway, and beyond the waters again to Ontario / Canada to the west. A mostly rural forested area, the North Country includes seven counties (or 14, according to another group) of the 62 in New York state. Fort Drum, a United States Army base, is also located in the North Country region in Jefferson County, near Watertown, as is the adjacent Adirondack Park of 6.1 million acres, established 1892 as the oldest state park in the nation, and preserved / operated by the Adirondack Park Agency and the New York State Department of Environmental Conservation. As of 2024, the population of the region was 420,311 (revised figure from the last 2020 United States census).

The term "North Country" was first widely popularized within New York by the 1900 novel Eben Holden by Irving Bacheller.

The minister of transport (French: ministre des transports) is a minister of the Crown in the Canadian Cabinet. The minister is responsible for overseeing the federal government's transportation regulatory and development department, Transport Canada, the Saint Lawrence Seaway, Nav Canada, and the Port Authority system. Since September 16, 2025, the position has been held by Steven MacKinnon of the Liberal Party.

This is a list of ports and harbours of the Atlantic Ocean, excluding the ports of the Baltic Sea.

For inland ports on rivers, canals, and lakes, including the Great Lakes, Saint Lawrence Seaway, and Mississippi River, see inland port.