Richelieu River

French  Rivière Richelieu,   river in Montérégie region, southern Quebec province, Canada, rising from Lake Champlain, just north of the Canada-U.S. border, and flowing northward for 75 miles (120 km) to join the St. Lawrence River at Sorel. Explored in 1609 by Samuel de Champlain and named in 1642 in honour of the Cardinal de Richelieu, chief minister of the French king Louis XIII, the river served repeatedly as an attack