Saint Marys River

from The American Heritage® Dictionary of the English Language, 5th Edition.

• A river, about 210 km (130 mi) long, rising in southeast Georgia in the Okefenokee Swamp and flowing eastward along the Georgia-Florida border to the Atlantic Ocean.
• A river, about 120 km (75 mi) long, flowing from Lake Superior to Lake Huron and forming part of the US-Canadian border.