Great Lakes of U.S. & Canada

Exploring the Great Lakes, Session I
This series of interconnected freshwater lakes located in the upper mid-east region of North America, on the Canada–United States border, and referred to as the Inland Sea, contains over 20% of the earth's fresh water, and has major ports including Chicago, Duluth, Detroit, Cleveland and Toronto. There are innumerable smaller ports in the lakes as well, many of them hosting Tall Ships Challenge Port Festivals. The St. Lawrence Seaway, named for the river, is a system of locks, canals and channels in Canada and the United States that permit ocean-going vessels to travel from the Atlantic Ocean as far inland as the western end of Lake Superior. Many tall ships have transited the seaway as far as Duluth, although those with taller rigs may have to lower their topmasts.