Canada is a maritime nation with access to three oceans (Atlantic, Pacific, and Arctic), and shared access to the longest inland waterway system in the world, the Great Lakes St. Lawrence Seaway system of waterways. The map shows approximately 700 small craft harbours, the Seaway (including major locks) and vessel traffic service zones. The Canada Marine Act governs Canada’s port and harbour systems. The 700 harbours form the National Harbour System, managed by Fisheries and Oceans Canada to ensure that harbours are safe and accessible for commercial fisheries and recreational boaters. The Canada Shipping Act provides for regulations which govern vessel traffic in the 11 vessel service traffic zones.