Explanation:

The North Koel rises on the Chhota Nagpur plateau and enters Latehar district , below Netarhat near Rud. After flowing nearly due west for about 32 kilometres (20 mi), it turns north at an almost complete right angle through a gorge at Kutku, and flows through the centre of the district until it falls into the Son a few miles north-west of Haidarnagar.

The principal tributaries are the Auranga and the Amanat, both of which join it from the east, the former at Kechki, 16 kilometres (10 mi) south and the latter 8 kilometres (5 mi) north of Daltonganj. Another tributary is the Burha, which joins the North Koel above Kutku at Bagechampa.