File:Exit to du Fort-Lennox and du Canal-de-Chambly, Saint-Jean-sur-Richelieu, Quebec (30068643245).jpg

Fort Lennox occupies most of Île aux Noix, an island in the middle of the Richelieu River in the parish of Saint-Paul-de-l'Île-aux-Noix, Quebec, near the Canada-U.S. border. The fort features restored defense works and stonework buildings, and is surrounded by a star-shaped moat.

Fort Lennox was designated a National Historic Site of Canada in 1920.

Built by the British between 1819 and 1829, the fort was designed to protect the colony from possible American invasion. The fort was named after Charles Lennox, 4th Duke of Richmond, who died in 1819 and was Governor General of British North America. An earlier 1760s fort on the same site was originally built by the French during the Seven Years' War.

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The Chambly Canal is a National Historic Site of Canada in the Province of Quebec, running along the Richelieu River past Saint-Jean-sur-Richelieu, Carignan, and Chambly. Building commenced in 1831 and the canal opened in 1843. It served as a major commercial route during a time of heightened trade between the United States and Canada. Trade dwindled after World War I, and as of the 1970s, traffic has been replaced by recreational vessels.

It is part of a waterway that connects the Saint Lawrence River with the Hudson River in the United States. Lake Champlain and the Champlain Canal form the U.S. portion of the Lakes to Locks Passage.

The Canal has 10 bridges—8 of which are hand operated—and nine hydraulic locks.

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