Umtru River

Its birthplace is Meghalaya’s Garo-Khasi hills. It travels northeast, where it crosses the Kopili River before joining the Brahmaputra River in Assam. Another name for it is the Digaru River. It goes through Byrnihat, an industrial city. The most polluted city in the world is Byrnihat, which is located on the border of Meghalaya and Assam, according to the 2024 World Air Quality Report, which was released by IQAir, a Swiss company that monitors air quality worldwide.