There are several waterways that share this name.

  • St. Mary's River, Florida is a river separating Georgia and Florida.
  • St. Mary's River, Maryland is a stream and state park in southern Maryland.
  • St. Mary's River, Ohio is a river that forms the Maumee River at a confluence with the St. Joseph River in Fort Wayne, Indiana.
  • St. Mary's River, Ontario is a river flowing between Michigan and Ontario.

See also St. Mary River, a river in the Hudson Bay watershed.

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