St. Marys River (Michigan–Ontario) St. Marys River (Michigan–Ontario) The St. Marys River (), sometimes written as the St. Mary's River, drains Lake Superior, starting at the end of Whitefish Bay and flowing southeast into Lake Huron, with a fall of . For its entire length it is an international border, separating Michigan in the United States from Ontario, Canada. The twin cities of Sault Ste. Marie, Ontario, and Sault Ste. Marie, Michigan are connected across the St. Marys River by the Sault Ste. Marie International Bridge. The St. Marys Rapids are just below the river's exit from Lake Superior and can be bypassed by
Sault Ste. Marie, Ontario was named HMCS "Sault Ste. Marie" (J334) after the city. It was laid down in 1942 and acted as a convoy in the Battle of the Atlantic. On January 29, 1990, Sault Ste. Marie became a flashpoint in the Meech Lake Accord constitutional debate when council passed a resolution declaring English as the city's official language and the sole language for provision of municipal services. The city had a sizable French-speaking population and these residents objected strongly to the council's action. The Sault Ste. Marie language resolution was not the first of its kind in Ontario, but the municipality was