Its historically irregular course , alternating between two beds on the north and south of the Mont Saint-Michel but eventually definitely settling to the south bed , inspired the saying `` The Couesnon 's madness placed Mont Saint-Michel in Normandy '' ( `` le couesnon en sa folie mit le Mont en Normandie '' ) , as the Mont is just to the Norman side of the river 's current mouth .
This created ( made ) the saying `` The Couesnon 's madness placed Mont Saint-Michel in Normandy '' ( in french , `` le couesnon en sa folie mit le Mont en Normandie '' ) , as the mount is just to the Norman side of the river 's mouth , now .