The Luni is a river of western Rajasthan state, India. It originates in the Pushkar valley of the Aravalli Range, near Ajmer and ends in the marshy lands of Rann of Kutch in Gujarat, after travelling a distance of 530 km. It is first known as Sagarmati, then after passing Govindgarh, it meets its tributary Sarsuti, which originates from Pushkar Lake, and from then on it gets its name Luni. In 1892, Maharaja Jaswant Singh of Jodhpur constructed Jaswant Sagar on Luni River in Pichiyak village between Bilara and Bhavi of Jodhpur district. It is one of the largest artificial lake in India, and irrigates more than 12,000 acres (49 km2).
It is also known as Lavanavari river. It means "Salt River" in Sanskrit, due high salinity of its water.