Lake Ontario

n. easternmost lake of North American Great Lakes which is the smallest in the area

For the putative lake on Titan, see Ontario Lacus Lake Ontario, bounded on the north by the Canadian province of Ontario and on the south by Ontario's Niagara Peninsula and by New York State, U.S., is one of the five Great Lakes of North America.
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Noun
1. the smallest of the Great Lakes
(synonym) Ontario
(hypernym) lake
(part-holonym) Great Lakes