Question

How many of the great lakes form the border between the us and canada?

Answer 1

All 5. Huron, Superior, Michigan, Erie, and Ontario are between the US and Canada

Answer 2

The Great Lakes are the five largest lakes in the United States and include Lake Superior, Lake Huron, Lake Michigan, Lake Erie, and Lake Ontario. They are located in the northern Midwest along the border between the United States and Canada.

So basically all 5.