<P> The Luni River begins near Ajmer in the Pushkar valley of the western Aravalli Range at an elevation of about 550m . At this point, the river is also known as the Sagarmati . The river then flows in the southwest direction through the hills and plains of the Marwar region in Rajasthan . The river flows south - west and enters the Thar Desert before dissipating into the Rann of Kutch, traversing a total of 495 km . In spite of the high salinity, it is a major river in the region and serves as a primary source of irrigation . The Luni is not saline until it reaches Balotra, where high salt content in the soil impacts the river . </P> <P> The Luni may have been the southern portion of the historic Ghaggar - Hakra river channel . </P>

Which river does not merge into sea in india