Canton of Plancoët

Plancoët (French pronunciation: [plɑ̃kwɛt]; Breton: Plangoed; Gallo: Plancoét) is a commune in the Côtes-d'Armor department in Brittany in northwestern France. The Arguenon river flows through the commune.

Saint-Lormel (French pronunciation: [sɛ̃ lɔʁmɛl]; Breton: Sant-Loheñvel) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. The Arguenon river flows through the commune.

Créhen (French pronunciation: [kʁeɛ̃]; Breton: Krehen; Gallo: Qerhen) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. The Arguenon river flows through the commune.

Pluduno (French pronunciation: [plydyno]; Breton: Pludunoù; Gallo: Ploedunoe) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. The Arguenon river flows through the commune.

The Arguenon (French pronunciation: [aʁɡənɔ̃]; Breton: Argenon) is a French coastal river in the Côtes-d'Armor department of the Brittany region. It flows into the English Channel.

The Singing Stones of Brittany (or Pierres sonnantes du Guildo) are a number of rocks located on the left bank of the river Arguenon opposite the ruined castle of Gilles de Bretagne at Notre-Dame-le-Guildo, near Dinard in the Côtes-d'Armor, France. The stones are round and smooth, shiny black and extremely large, weighing in excess of ten tonnes each and are made of a heavy metallic stone that rings like a bell if struck by another smaller piece of the same stone. There are hundreds of tonnes of them and there is no indication of where they came from or how they got there. They are basalt, but this type of rock is usually associated with volcanic eruptions and there is no evidence or history of volcanic activity there. The stones are unlike any of the surrounding stones either on the ground or on the cliff face overlooking them; legend has it that these stones were spewed up by the giant Gargantua.

Trégon (French pronunciation: [tʁeɡɔ̃]; Breton: Tregon-Poudour) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2017, it was merged into the new commune Beaussais-sur-Mer.

Saint-Pôtan (French pronunciation: [sɛ̃ potɑ̃]; Breton: Sant-Postan) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. It takes its name from Saint Pôtan, the namesake of the commune's church. It has grown steadily since 2011 owing to new housing estates and contains a small variety of shops. It is surrounded by more than a dozen stone crosses. In the village of Saint-Pôtan is a manor house now called «Le Vaumeloisel», which used to be a chateau before being destroyed in the French Revolution. This chateau once welcomed the Duchess Anne of Brittany, who married two French kings, and is now a family house. The family who once lived in this house were the Guyon family, who are French aristocrats who own many manor houses in the department of Côtes-d'Armor. One of these includes the well known Fort-la-Latte chateau, where the movie The Vikings was filmed. Much local employment comes from agriculture and tourism, but it is also the home of Sodimac, the major employer of the commune, a manufacturer of agricultural machinery and steel building components.

Corseul (French pronunciation: [kɔʁsœl]; Breton: Kersaout; Gallo: Corsoeut) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. The town was a major Roman town and contains Roman ruins. The town hall contains a small archaeological museum.

Plessix-Balisson (French pronunciation: [plɛsi balisɔ̃]; Breton: Ar Genkiz-Yuzhael) is a former commune in the Côtes-d'Armor department of Brittany in northwestern France. On 1 January 2017, it was merged into the new commune Beaussais-sur-Mer. With an area of only eight hectares, Plessix-Balisson was the smallest commune of the region and the second smallest in France, after Castelmoron-d'Albret.

Saint-Maudez (French pronunciation: [sɛ̃ mode]; Breton: Sant-Maodez) is a commune in the Côtes-d'Armor department of Brittany in northwestern France. It is named after the Breton Saint Maudez.

Saint-Jacut-de-la-Mer (French pronunciation: [sɛ̃ ʒaky də la mɛʁ], literally Saint-Jacut of the Sea; Breton: Sant-Yagu-an-Enez) is a commune in the Côtes-d'Armor département of Brittany in northwestern France.