Explain the significance of river St Lawrence as an inland waterway.

St. Lawrence waterway serves as the most significant industrial areas of the United States of America as well as of Canada. The estuary of St. Lawrence River along with the Great Lakes forms a distinct commercial waterway in the Northern region of North America. The ports on this route such as Buffalo and Duluth tend to be equipped with every facility of ocean ports which makes navigation of large ocean-going vessels up the river in the inner deep continent to Montreal possible. Thus, in this way, the inland waterway has become one significant commercial waterway.