Which Great Lakes Border Canada? Four of Five

Of the five Great Lakes, four share a shoreline with Canada:

• Lake Superior (largest by area)
• Lake Huron (includes Georgian Bay)
• Lake Erie (shallowest, warmest)
• Lake Ontario (smallest by area, deepest)

Lake Michigan is the only Great Lake entirely within the United States.

The Canada–U.S. border runs through the lakes' centers (except Lake Michigan), established by the 1909 Boundary Waters Treaty.