The Saint-Lawrence River is a major waterway in North America, flowing from the Great Lakes to the Atlantic Ocean. It serves as a natural border between Canada and the United States, primarily in the province of Quebec and the state of New York. The river is approximately 1,197 kilometers (744 miles) long and plays a crucial role in transportation, commerce, and ecology. The river is also known for its rich biodiversity, supporting various fish species and wildlife. It is a vital route for shipping and trade, connecting the interior of North America to global markets. The Saint-Lawrence Seaway allows large vessels to navigate the river, enhancing its economic importance.