The Ille is linked to the semi-tidal Rance river by the Canal d'Ille-et-Rance.

By this canal, Rennes has a connection with the English Channel coast at St. Malo.

The Ille flows through the department Ille-et-Vilaine and the following towns: Montreuil-sur-Ille, Betton and Rennes.

From Montreuil to Rennes the river runs parallel to the Canal d'Ille-et-Rance.

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