Assam can be identified as comprising three major physiographical divisions of which the Brahmaputra Valley, Barak Valley and the Karbi Anglong and North Cachar hills are the most identifiable. The Brahmaputra Valley, identified in the northern part of Assam, is the largest and most prominent plain of the Brahmaputra River, measuring approximately 80-100 km in width and nearly 1000 km in length. The Barak Valley, located in the southern part of Assam, is also a plain and is bounded by hills on three sides. The Karbi Anglong and North Cachar hills is the hilly region situated between the Brahmaputra and Barak valleys. To summarize, these three divisions are:
- Brahmaputra Valley: The largest and most prominent division occupying the northern part of Assam. The Brahmaputra Valley is a plain associated with the Brahmaputra River with an approximate area of 80-100 km in width and almost 1000 km long from one extremity to the other.
- Barak Valley: Located in the southern part of Assam this division is also a plain, bounded by hills on three sides.
- Karbi Anglong and North Cachar Hills: A hilly region located in the middle of Assam between the Brahmaputra and Barak valleys.
