Alcona County has a shoreline on Lake Huron. Through Lake Huron, Alcona County has a water boundary with the Canadian province of Ontario. The Au Sable River flows through the southwest of the county.
Alcona County has a shoreline on Lake Huron. Through Lake Huron, Alcona. County has a water bo,undary with the Can:adi?an province of Ontario. The Au Sable River flows thr.ough the southwest of the county.