Lake Ontario

Lake Ontario is one of the five Great Lakes of North America. It is surrounded 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, whose water boundaries, along the international border, meet in the middle of the lake.

Lake Ontario
Lake Ontario shoreline in Mississauga, Ontario
Lake Ontario
Lake Ontario bathymetric map.[1][2][3] The deepest point is marked with "×".[4]
LocationNorth America
GroupGreat Lakes
Coordinates43.7°N 77.9°W / 43.7; -77.9
Lake typeGlacial
EtymologyOntarí:io, a Huron (Wyandot) word meaning "great lake"
Primary inflowsNiagara River
Primary outflowsSt. Lawrence River
Catchment area24,720 sq mi (64,000 km2)[5]
Basin countriesCanada and United States
Max. length193 mi (311 km)[6]
Max. width53 mi (85 km)[6]
Surface area7,340 sq mi (19,000 km2)[5]
Average depth283 ft (86 m)[6][7]
Max. depth802 ft (244 m)[6][7]
Water volume393 cu mi (1,640 km3)[6]
Residence time6 years
Shore length1634 mi (1,020 km) plus 78 mi (126 km) for islands[8]
Surface elevation243 ft (74 m)[6]
SettlementsToronto, Ontario
Mississauga, Ontario
Hamilton, Ontario
Rochester, New York
References[7]
1 Shore length is not a well-defined measure.
Lake Ontario and the other Great Lakes

The Canadian cities of Toronto, Kingston, Mississauga, and Hamilton are located on the lake's northern and western shorelines, while the American city of Rochester is located on the south shore. In the Huron language, the name Ontarí'io means "great lake". Its primary inlet is the Niagara River from Lake Erie. The last in the Great Lakes chain, Lake Ontario serves as the outlet to the Atlantic Ocean via the Saint Lawrence River, comprising the eastern end of the Saint Lawrence Seaway. The Moses-Saunders Power Dam regulates the water level of the lake.[9]


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