The correct answer is: Rajgir hilly region.
The Rajgir hilly region is located in the southern part of Bihar. It is a popular tourist destination, known for its many historical and religious sites. The region is also home to a number of hill stations, including Rajgir, Nalanda, and Pawapuri.
The Rajgir hilly region is a part of the Vindhyan Range. The region is characterized by its rolling hills, valleys, and forests. The climate in the region is temperate, with warm summers and cool winters.
The Rajgir hilly region is home to a number of important historical and religious sites. These include the Mahabodhi Temple, the Rajgir Fort, and the Nalanda University. The region is also home to a number of Jain temples.
The Rajgir hilly region is a popular tourist destination. The region is known for its beautiful scenery, its historical and religious sites, and its hill stations.
The other options are incorrect because they are not located in the southern part of Bihar.
- Munger hilly region is located in the western part of Bihar.
- Gaya hilly region is located in the central part of Bihar.
- Nawada hilly region is located in the eastern part of Bihar.