Lake Ontario

one of the Great Lakes in North America
Lake Ontario seen from near Wolcott, New York, USA
Lake Ontario shown in darker blue

Lake Ontario is the smallest of the Great Lakes in North America.

It forms most of the border between Ontario in Canada and New York in the United States of America. Its inlet is the Niagara River (from Niagara Falls), and its outlet is the Saint Lawrence River. Nearly 9 million Canadians live near Lake Ontario. It is the only Great Lake that does not touch the U.S. state of Michigan, the "Great Lakes State".