
The St Lawrence Seaway is a system of locks, canals and channels that allows for ocean going ships to travel from the Atlantic Ocean to the western end of Lake Superior, a distance of 3,750 kms. The Canadian stamp shows a compressed view of the 15 locks with the seven on the right on the St Lawrence River, the Welland Canal in the middle, and the Great Lakes and the locks at Sault Ste Marie on Lake Superior. The American stamp shows an aerial view of the route with the mouth of the St Lawrence River on the bottom right.For Sunday Stamps - your choice 







