Rohni River
At Gorakhpur it becomes a left bank tributary of West Rapti River , which in turn joins the Ghāghara above Gaura Barhaj , then Ghaghara in turn joins the Ganges . 
<triplet> West Rapti River <subj> Ghāghara <obj> mouth of the watercourse <triplet> Ghāghara <subj> Ganges <obj> mouth of the watercourse