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Lake Ontario is one of the five Great Lakes of Canada. 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.
Via the St. Lawrence Seaway, Lake Ontario is the region’s gateway to the world. Lake Ontario, known as the Lower Lake, sits below the 380 foot escarpment that creates Niagara Falls. The Falls kept Lake Ontario separate from the rest of the lakes until the 1830’s.
Ontario is located in east-central Canada. Ontario is bordered by the James Bay and Hudson Bay to the north; Lake Superior, Lake Huron, Lake Erie, Lake Ontario, and the United States to the south; Quebec to the east; and Manitoba to the west.
Mar 27, 2023 · Ontario is bordered by the Canadian provinces of Manitoba in the West and Quebec in the east and northeast; by the US States of Minnesota, Michigan, Wisconsin, New York, Ohio, Pennsylvania, and the four Great Lakes (Lake Superior, Lake Huron, Lake Ontario, and Lake Erie) in the south; and by the James Bay and the Hudson Bay in the north.
Lake Ontario (43°30'N, 78°00'W) is the eastern-most and smallest in surface area (7,540 square miles, 19,529 km²) of the Great Lakes, although it exceeds Lake Erie in volume (393 cubic miles, 1639 km³). It is the 14th largest lake in the world and has a shoreline 712 miles (1146 km) long.
Lake Ontario is shared by the Canadian province of Ontario and the U.S. state of New York. The largest city on the American side is Rochester; the largest on the Canadian side is Toronto. Both countries' cities of Niagara Falls are nearby. The Thousand Islands region lies at the lake's outlet.
Lake Ontario is 18,960 km2 (10,000 km2 in Canada), with a drainage area of 60,030 km2, an elevation of 75 m, a mean depth of 86 m (max 244 m), length 311 km an...
