Maruts , Dyaus and Prthivi (Heaven and Earth), Savitar , Brhaspati and Soma - Rudra . The rivers mentioned in the sixth Mandala are the Sarasvati , Yavyavati and Hariupiya . RV 6.61 is entirely dedicated to Sarasvati. In RV 6.45.31 the term Ganga occurs which may refer to the Ganges