Which of the following National Waterways lies entirely within the state of Assam?

The correct answer is NW-6 . Key Points National Waterway 6 (NW-6) is situated on the Aai River , a significant tributary of the Brahmaputra, located entirely within the state of Assam . The total length of this waterway is approximately 121 kilometers , stretching from the confluence of the Aai River with the Brahmaputra to the Indo-Bhutan border . It was officially designated as a national waterway under the National Waterways Act, 2016 , which aimed to expand the inland water transport network across India. The development of NW-6 specifically benefits the Bongaigaon and Chirang districts of the Bodoland Territorial Region by facilitating the movement of local agricultural products and timber. Managed by the Inland Waterways Authority of India (IWAI) , this route is part of a larger initiative to provide cost-effective and fuel-efficient transport alternatives in the Northeast region . Additional Information NW-7 : Location: This waterway is located on the Ajay River in the state of West Bengal . Length: It covers a total distance of approximately 96 kilometers . NW-8 : Location: Situated in Kerala , it comprises the Alappuzha-Changanassery Canal . Purpose: It serves as a vital corridor for passenger traffic and tourism in the Kerala Backwaters , spanning 28 kilometers . NW-5 : Coverage: This is a multi-state waterway encompassing the Brahmani River , Matai River , and the East Coast Canal . Geography: It spans approximately 623 kilometers across the states of Odisha and West Bengal , making it one of the longest waterways in the eastern sector.