Question

is luni lake a fresh water lake

Answer 1

Hope it helps you.
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Luni lake is not a fresh water lake located in Rajasthan.
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Answer 2

Luni is a river in Rajasthan. It originates in the Pushkar valley of the Aravalli Range, near Ajmer, passes through the southeastern portion of the Thar Desert, and ends in the marshy lands of Rann of Kutch in Gujarat, after travelling a distance of 495 km. It is first known as Sagarmati, then after passing Govindgarh, it meets its tributary Saraswati, which originates from Pushkar Lake, and from then on it gets its name Luni.[1]

In 1892, Maharaja Jaswant Singh of Jodhpur constructed Jaswant Sagar in Pichiyak village between Bilara and Bhavi of Jodhpur district. It is one of the largest artificial lakes in India, and irrigates more than 12,000 acres (49 km2).[1] after flowing some river it became salty