Two Major Port Cities on the St. Lawrence River: Montreal and Quebec City

The St. Lawrence River, the great gateway to the Great Lakes, hosts two major Canadian port cities:

1. Montreal, Quebec

Canada's largest port by tonnage and second-largest city. Located at the head of ocean navigation (freshwater/saltwater transition). Handles containers, grain, petroleum, cruise ships. Major logistics hub: rail (CN, CPKC), highway, Seaway access. Diverse economy: aerospace, AI, finance, culture.

2. Quebec City, Quebec

Historic capital, oldest port in Canada (1608). Strategic narrowing of river (Cap Diamant). Handles bulk (grain, ore, alumina), containers, cruise tourism (UNESCO Old Quebec). Gateway to Saguenay–Lac-Saint-Jean region. Major employer: Port of Quebec.

Strategic Importance

Both are on the St. Lawrence Seaway (locks to Great Lakes). Montreal is the effective head of deep-draft navigation; Quebec City marks the start of tidal influence. Together, they anchor Quebec's maritime economy and North American inland shipping.