Explanation: The Sankosh River is a significant geographical feature in northeastern India, particularly in the states of Assam and Arunachal Pradesh. It is a tributary of the Brahmaputra River and plays a crucial role in the region's geography, ecology, and cultural landscape.
The Sankosh River originates in the hills of Arunachal Pradesh and flows westward into Assam. It forms a natural boundary between these two states, contributing to the unique ecological and cultural characteristics of the region. The river is known for its scenic beauty and is an important part of the local ecosystem, supporting a diverse range of flora and fauna.
Understanding the geographical boundaries formed by rivers is essential in Indian geography, especially in the northeastern region, which is characterized by a complex network of rivers and tributaries. The Sankosh River, along with other rivers like the Brahmaputra, Dihang, and Dibang, forms a significant part of the region's hydrography.
It is important to note that the northeastern states of India are geographically and culturally distinct from the rest of the country. The Sankosh River, as a boundary between Assam and Arunachal Pradesh, highlights the unique geographical and cultural identities of these states. Students should be familiar with the major rivers and their roles in defining state boundaries to better understand the geographical layout of northeastern India.
In summary, the Sankosh River forms a natural boundary between Assam and Arunachal Pradesh, making option B the correct answer. This river is a key geographical feature in the northeastern region of India, contributing to the ecological and cultural diversity of the area.