Crossword clues for River flowing into the Danube. 4 letters:SAVAYugoslav river, flowing into Danube.ISARRiver flowing into the Danube.ENNSRiver flowing into the Danube.TRAUNAustrian river, flowing into Danube.SIRETRumanian river flowing into Danube.ILLERRiver flowing into the Danube near Ulm.INNRiver flowing into the Danube.DRAVERiver flowing 450 miles into the Danube.