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 (electoral district) city of Sault Ste. Marie and some immediately surrounding communities. It consisted initially of the City of Sault Ste. Marie and the Township of Prince. In 1976, it was redefined to consist of the part of the City of Sault Ste. Marie east of Allen's Side Road and south of the Second Line. In 1987, it was redefined to consist of the part of the City of Sault Ste. Marie lying south of Third Line and the part of Rankin Location 15D lying within the city limits. In 1996, it was redefined to consist of the City of Sault Ste.