Britannica Sources used in this answer

Which major rivers flow through Brittany?

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The old walled city of Saint-Malo, Brittany région, France. — Brittany The old walled city of Saint-Malo, Brittany *région*, France.

The principal rivers that flow through the Brittany region include the Vilaine, the Leita, and the Rance.1

The Rance River rises in the Côtes-d’Armor department and flows for 60 miles before forming an estuary at Saint-Malo. Additionally, the Gulf of Saint-Malo receives several rivers, including the Trieux, the Rance, the Couesnon, and the Sélune.23