Rhodanien may refer to:the Rhone river or its valley le sillon rhodanien, which is the name of the long, straight Saône and Rhone river valleys, a deep cleft running due south to the Mediterranean and separating the Alps from the Massif Central Rhodanien, a dialect of the Lyon région, and of the Franco-Provençal language Provençal rhodanien, a dialect of the Nîmes, Arles and Avignon régions, and a sub-dialect of the Provençal dialect Le Rhodanien (train), which ran between Geneva/Paris and Marseille