Answer : 1. "Tonk and Sawai Madhopur"
Explanation :

1. 'Isarda Dam Project' has been constructed in the Tonk and Sawai Madhopur districts.

2. It is on the banks of river Banas in Isarda village.

3. It envisages providing safe drinking water facilities to approximately 25 lakh rural and urban population, benefiting 1,079 villages, five towns in Dausa, Rajasthan and 177 villages, and one town in Sawai Madhopur district.