How many Great Lakes are located between Ontario and the United States?

Discover Canada records this in one direct sentence. The guide writes: There are five Great Lakes located between Ontario and the United States: Lake Ontario, Lake Erie, Lake Huron, Lake Michigan (in the U.S.A.) and Lake Superior, the largest freshwater lake in the world. The number the test wants is therefore five.

Five lakes named individually. Discover Canada commits the Great Lakes to FIVE specific names: Lake Ontario, Lake Erie, Lake Huron, Lake Michigan, and Lake Superior. Of the five, four form part of the boundary between Ontario and the United States — Lake Michigan is entirely inside the U.S.A. and is the only Great Lake not shared with Canada.

Lake Superior is a world record-holder. Discover Canada writes that Lake Superior is "the largest freshwater lake in the world." So the Great Lakes are not just a regional border feature — they include a world-record body of water. Together, the five Great Lakes hold roughly one-fifth of the world's surface fresh water.

The Great Lakes anchor a population corridor. Discover Canada writes that "more than half the people in Canada live in cities and towns near the Great Lakes and the St. Lawrence" river system. So the Great Lakes are not just a border — they are the heart of Canada's most densely populated region. Toronto, the country's largest city and main financial centre, sits on Lake Ontario. Founded by United Empire Loyalists, Ontario also has the largest French-speaking population outside Quebec — and Niagara, where the lakes drop from one level to the next, is famous for its vineyards, wines, and fruit crops. So the Great Lakes are at once a border, a freshwater wonder, and the geographic backbone of Canadian central population, industry, and agriculture. The five lakes together define the Ontario-United States boundary along southern Canada's most populous province. So when the test asks how many Great Lakes lie between Ontario and the U.S., the source-precise answer is five.

The question is testing whether new citizens know the number of Great Lakes between Ontario and the United States. Discover Canada commits to one number: five. The right test answer matches that.

The wrong answer choices each pick a different number. "3" is too few — there are more than three Great Lakes. "4" is also too few — though only four are shared between Canada and the U.S., the SOURCE names FIVE Great Lakes total. "6" exceeds the actual number — there are five Great Lakes, not six. Only five — the source's exact named number — matches.