Which major river valley forms the dominant physical landscape of Assam?

The correct answer is Brahmaputra Valley . Key Points The Brahmaputra Valley , also known as the Assam Valley , constitutes the most significant physiographic division of Assam , covering approximately 56,194 square kilometers of the state's total area. It is an aggradational plain formed by the depositional work of the Brahmaputra River and its numerous tributaries, stretching nearly 720 kilometers in length from Sadiya in the east to Dhubri in the west. The valley is bounded by the Eastern Himalayas (Bhutan and Arunachal Pradesh) to the north and the Shillong Plateau , Karbi Anglong , and Barail Range to the south. This region is characterized by an extremely gentle gradient , leading to the formation of numerous river islands , including Majuli , which is recognized as one of the largest inhabited riverine islands in the world. The landscape is dotted with ox-bow lakes , locally known as Beels , and vast stretches of alluvial fertile land that support the state's dominant tea cultivation and paddy farming . Additional Information Ganga Valley Located in Northern India , it forms the major part of the Indo-Gangetic Plain . It spans across states such as Uttarakhand , Uttar Pradesh , Bihar , and West Bengal , but does not enter Assam . Godavari Valley Part of the Peninsular river system , the Godavari is the longest river in Southern India . It drains the states of Maharashtra , Telangana , Chhattisgarh , and Andhra Pradesh . Narmada Valley Situated in Central India , it is a prominent rift valley located between the Vindhya and Satpura mountain ranges. The river flows westwards through Madhya Pradesh , Maharashtra , and Gujarat before emptying into the Arabian Sea .