Explanation:

The Koderma plateau is also referred to as the Hazaribagh lower plateau or as the Chauparan-Koderma-Girighi sub-plateau. The northern face of the Koderma plateau, elevated above the plains of Bihar, has the appearance of a range of hills, but in reality it is the edge of a plateau, 240 metres (800 ft) from the level of the Gaya plain. Eastward this northern edge forms a well-defined watershed between heads of the tributaries of Gaya and those of the Barakar River, which traverses the Koderma and Giridih districts in an easterly direction.