Digaru

Digaru is a river originating in the Garo-Khasi hills of Meghalaya state in India, flowing towards the northeast and then meeting the Kolong river and then merging with the Brahmaputra river. The name Digaru originated from a Kachari/Mech word 'Di' which means water and 'Garo' means the people living in the Garo hills. Hence Digaru literally means "water of the Garo".

...
Wikipedia