Sault Sainte Marie
City in Michigan or town in Ontario, Canada. ’Soo’ is meaningless in itself, yet widespread is its application to these two cities that everybody will understand if you are going to the Canadian and American Sault Ste. Marie, if you say, ‘I am going to the Canadian Soo and American Soo.’
International Book of Names by C.O. Sylvester Mawson, 1933.