Contained within the 2nd Edition (1915) of the Atlas of Canada is a map that shows the canals, routes and types of Lighthouses along the St. Lawrence and Great Lakes, circa 1915. There is a table of sailing distances, in geographical miles, between the ports of the United States and Canada on the Great Lakes and St. Lawrence. Statistics of freight and passenger traffic through the canals, total cost of maintenance, and the construction of Canadian canals, are shown as of 1910 and 1911. There are also steamship routes from Canadian ports to other ports in Canada and in the U.S. The lighthouses are distinguished between fixed, revolving lights, and light ships. The water depth in the Great Lakes is indicated by contours and tints of blue. The deeper portions are shown in the darker tints, while lighter tints indicate more shallow waters.