From Sr Malo you can see acrosss the Rance the swanky french resort town of Dinard. Try as I might I could not find a bicycle route across the Barriage (dam and bridge across to Dinard). It was a freeway. I on the freeway tried but got a bit worried about getting back if the police stopped me. Luckily there was a small road off the freeway which lead amazingly to Chateaux Briantais...my first Chateau.