Saint-Cast-le-Guildo (Breton: Sant-Kast-ar-Gwildoù, Gallo: Saent-Cast-le-Giledo) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. It is port city on the English Channel as it also has a nautical center, the Centre Nautique de Saint-Cast (CNSC) ranked 3rd to 6th in the nation.
The river Arguenon flows through the commune, where it empties into the sea.


Inhabitants of Saint-Cast-le-Guildo are called "castelgildois" in French.

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