Why did settlement in Quebec concentrate along the St. Lawrence River?

Settlement in Quebec concentrated along the St. Lawrence River primarily because the river served as the essential gateway for exploration, trade, and transportation into the interior of North America.12

The river's strategic importance was established early in the 17th century when French explorers, most notably Samuel de Champlain, recognized that the St. Lawrence and its tributaries provided the best access to the continent's interior, which was vital for controlling the lucrative fur trade. The river functioned as a primary artery for both commerce and communication, linking the region to international markets and facilitating the movement of goods and people.3142

Additionally, the geography of the St. Lawrence Lowlands offered accessible land for development. Under the French seigneurial system, land was divided into long, narrow strips fronting the river, which allowed settlers to maintain proximity to the water for transportation and communication while creating a continuous, dense line of settlement between major urban centers like Montreal and Quebec city.5