Definition of Saint Marys
1 river 175 miles (282 kilometers) long on the Florida–Georgia border flowing from the Okefenokee Swamp to the Atlantic Ocean
2 river about 70 miles (115 kilometers) long between Canada and the U.S. in Ontario and the Upper Peninsula of Michigan flowing from Lake Superior into Lake Huron and descending 20 feet (6.1 meters) in a mile at Saint Marys Falls — see sault sainte marie canals
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