Answer: Dudhkumar River
Notes: The Dudhkumar River, approximately 370 kilometers long, originates in Bhutan and flows through India and Bangladesh, ultimately draining into the Brahmaputra River. This river is significant as it traverses diverse ecosystems and supports local agriculture. The Dharla River, while also flowing through the region, does not originate in Bhutan. The Teesta River is another important river in the area, known for its hydropower potential.
