Answer : 2. "सोम"
Explanation :

The Som river originates from the Bichhameda hills located in the forests of Babalwada near Rishabhdev in Udaipur district. Flowing in Udaipur and Dungarpur, it joins Mahi at Beneshwar in Dungarpur. Som-Kagdar project has been built on this in Udaipur and Som-Kamala-Amba project has been built on this in Dungarpur. Tributaries – Jakham, Gomati, Sarni, Tindi.