Île aux Noix is an island on the Richelieu River in Quebec, close to Lake Champlain. The island is the site of Fort Lennox National Historic Site of Canada. Politically, it is part of Saint-Paul-de-l'Île-aux-Noix.

The Richelieu River is a river of Quebec, Canada, and a major right-bank tributary of the St. Lawrence River. It rises at Lake Champlain, from which it flows northward through Quebec and empties into the St. Lawrence. It was formerly known by the French as the Iroquois River and the Chambly River, and was named for Cardinal Richelieu, the powerful minister under Louis XIII.