Kaimur Hills: Eastern Vindhya Range Extension

The question asks to identify the district in Bihar where the Kaimur Hills, the easternmost part of the Vindhya Range, concludes its geographical extent. These hills form a significant geological feature, originating near the Jabalpur district in Madhya Pradesh.

Geographical Spread into Bihar

The Vindhya Range, a major mountain system in central India, extends eastward into the state of Bihar. The Kaimur Hills represent the continuation of this range into Bihar's western and southern regions.

• Origin: The range begins its eastward journey from Madhya Pradesh, near Jabalpur.
• Path into Bihar: It enters Bihar, forming a natural boundary and influencing the topography of the southwestern districts.
• Endpoint: The prominent hills associated with this range traverse through districts like Kaimur and Rohtas in Bihar.

Identifying the Final District

Geographical surveys and geological maps indicate that the Kaimur Hills extend significantly into the Rohtas district of Bihar. While the range influences the landscape of adjacent areas, Rohtas marks the primary region where these eastern extensions are most pronounced before transitioning into the plains or other geological formations.

Considering the options provided:

• Patna: The capital city, located north of the main Kaimur range alignment.
• Nawada: Situated southeast of Patna, it is not directly associated with the Kaimur Hills' easternmost reach.
• Rohtas: This district contains significant portions of the Kaimur plateau and hills, representing the continuation of the Vindhya range.
• Munger: Located further east, it is not part of the Kaimur Hills extension of the Vindhyas.

Therefore, based on the geographical extent of the Kaimur Hills as the easternmost part of the Vindhya Range entering Bihar, Rohtas district is the concluding area.