A brilliant feat of engineering, the St. Lawrence Seaway comprises a series of locks, canals and channels that allow ships and goods to travel from the Atlantic Ocean up the St. Lawrence River to Lake Superior. Seven locks point the way between Montreal and Lake Ontario, detouring past rapids and several dams. The 27-mile Welland Canal lifts ships over the Niagara Escarpment to Lake Erie, sidestepping Niagara Falls. The Canadian-and American-operated waterway is known locally as “Highway H2O” for the traffic and trade it allows.
