Great Lakes are an important water system of North America for transportation, commerce, and recreation. Lying on the border between the United States of America and Canada, they are the largest bodies of fresh water in the world making them an invaluable natural resource. The size is difficult to appreciate until you see them: at 94,250 square miles (244,100 km2) combined, the lakes are nearly as large as the United Kingdom, and a plane flying over one will not see land on any side.
Many boaters utilize the Great Lakes, St. Lawrence Seaway and their connection points as a travel route. There are many marinas and public boat ramps available for this purpose. Also, the Great Lakes Cruising Company and the American Canadian Caribbean Line provide cruises on the Great Lakes.