About Rennes Rennes is the historical capital of Brittany. It is located about 350km west of Paris and 110km north of Nantes. The city is only one hour from the seaside and its impressive attractions : Le Mont Saint-Michel, an iconic abbey built in the heart of an immense bay invaded by the highest tides in Europe. Saint-Malo, a famous walled corsair city. Cancale a port city known for its oysters.