Saint Mary's River
The St. Marys River (or St. Mary's River) may refer to:
- St. Marys River in Maryland in the United States.
- St. Marys River separating Georgia and Florida in the United States.
- St. Marys River in Indiana in the United States.
- St. Marys River is a river connecting Lake Superior and Lake Huron, flowing between Michigan and Ontario.
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