The capital city located on the St. Lawrence River is Quebec City.
Quebec City, known for its rich history and stunning architecture, is one of the oldest cities in North America. Situated along the banks of the St. Lawrence River, it serves not only as a political capital but also as a cultural hub of the province of Quebec. The river itself is a significant waterway that has played a vital role in the city’s development and the broader history of the region. With its iconic landmarks like the Château Frontenac and the old city walls, Quebec City is a testament to the blend of French and North American heritage.