Lake Ontario

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Lake Ontario
Lake Ontario, Lake Ontario
Wave in Lake Ontario.jpg
Looking east towards Toronto
Geographical location Ontario (Canada),
New York (USA)
Tributaries Niagara River , Oswego River , Trent River , Salmon River (New York) , Black River , Salmon River (Ontario) , Genesee River , Credit River
Drain Saint Lawrence River
Islands Wolfe Island , Amherst Island
Places on the shore Toronto , Mississauga , Rochester , Hamilton , Kingston
Coordinates 43 ° 42 ′  N , 77 ° 58 ′  W Coordinates: 43 ° 42 ′  N , 77 ° 58 ′  W
Lake Ontario (Ontario)
Lake Ontario
Altitude above sea level 75  m
surface 19,011 km²
length 311 km
width 85 km
volume 1639 km³dep1
scope 1146 kmdep1
Maximum depth 244 m
Middle deep 86 m
Template: Infobox Lake / Maintenance / EVIDENCE LAKE WIDTH Template: Infobox Lake / Maintenance / EVIDENCE VOLUME Template: Infobox Lake / Maintenance / EVIDENCE SCOPE

The Ontario ( English Lake Ontario ; French Lac Ontario ) is the smallest in area of the five Great Lakes of North America , which are interconnected by rivers.

In terms of depth and volume, however, it is the second smallest after Lake Erie .


View from Toronto's CN Tower

The United States' border with Canada runs through Lake Ontario . It lies at an altitude of 75  m and its area is 19,011 km². The Canadian maritime portion is 9,969 km² and the US maritime portion is 9042 km². For comparison: Its size is roughly the size of the German state of Rhineland-Palatinate ; it exceeds the area of ​​the largest lake in Europe, Lake Ladoga , by around 1000 km².

Niagara estuary

The water depth is up to 244 meters. The main inflow is via the Niagara River from Lake Erie . Other tributaries are the Trent River , the Genesee River , the Oswego River, and the Salmon River . Lake Ontario drains via the Saint Lawrence River . Due to the Arctic influence, the edge of the shore is frozen over an average of three months a year, but in summer it serves as a heat store, so that it can be used in the area around Niagara Falls and the like. a. the wine possible.

The water from the lake is also used for drinking water supply and for cooling office buildings in the city of Toronto (see DLWC ).

As with the other Great Lakes in North America, the tides are also  noticeable in Lake Ontario - unlike in many smaller inland lakes . Lake Ontario has around 1500 islands, the largest, Wolfe Island , is located at the eastern outflow of the lake in the Saint Lawrence River.


The name of the lake is derived from the Wyandot language , where the word ontarío means "great lake". The Canadian province was later named after Lake Ontario. The lake was sometimes called differently in early maps. In the relation des Jésuites he was named "Lac Ontario ou des Iroquois" or "Ondiara". A French map from 1712 named it "Lac Frontenac" after the French branch Fort Frontenac on the northeast bank . In the Iroquois language the lake was called "Skanadario".

Because of the similarities in shape and area, Lake Ontario gave its name to the Ontario Lacus on Saturn's moon Titan .


  • Arthur Pound: Lake Ontario. Indianapolis, New York, Bobbs-Merrill 1945.
  • Anne Ylvisaker: Lake Ontario. Fact Finders 2005, ISBN 978-0-7368-2211-4 .

Web links

Commons : Lake Ontario  - collection of images, videos and audio files
Wiktionary: Lake Ontario  - explanations of meanings, word origins, synonyms, translations

Individual evidence

  1. a b c d "Ontario, Lake." Encyclopædia Britannica 2006 Ultimate Reference Suite DVD
  2. ^ Marianne Mithun: The Languages ​​of Native North America , Cambridge: Cambridge University Press 2000, p. 312