Merriam-Webster Collegiate Dictionary - saint marys

 geographical name  1. river 175 miles (282 kilometers) on Florida-Georgia border flowing from Okefenokee Swamp to the Atlantic  2. river about 70 miles (115 kilometers) between Canada & United States in Ontario & Upper Peninsula of Michigan flowing from Lake Superior into Lake Huron; descends 20 feet (6.1 meters) in a mile at ~ Falls — see Sault Sainte Marie Canals