Answer : 4. "उदयपुर"
Explanation :

1. Aravali is a mountain range located in Rajasthan, the western part of India. Which is also known as Adawala Mountain in Rajasthan.

2. The major districts of the Aravalli range and hilly region are spread in the southwest of Alwar, Jaipur, Ajmer, Rajsamand, Udaipur, Sirohi and Tonk.

3. Whose length is 692 kilometers (from Palanpur to Delhi in Gujarat) and average height is 600 meters.

4. The highest peak of Aravali is Gurushikhar (1722 meters).

5. The maximum extent of the Aravalli mountain range is in the Udaipur district and the least extent is in the Ajmer district.