[3] The western portion of the Hazaribagh plateau constitutes a broad watershed between the Damodar drainage on the south and the Lilajan (also called Niranjana) and Mohana rivers on the north.

[1] The Mohana then runs north past Itkhori, descends into the Gaya Plains, and crosses the Grand Trunk Road / NH 2 at the foot of the Danua pass.

3.2 kilometres (2.0 mi) below Bodh Gaya it unites with the Lilajan (Niranjana) to form the Falgu.

The first at Tamasin is at the head of deep valley where the river plunges abruptly down a high steep face of black rock in to a shady pool below and then dashes down a gloomy gorge of strangely contorted rock; the lower falls at Hariakhal presents a scene of more placid beauty, as here the river, issuing through a picturesque glen, glides down the sloping slide of red rocks into a still, large pond surrounded by high wooden banks.

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