Explanation: The Brahmaputra River, originating from the Angsi Glacier in the Himalayas, is a significant river in Asia, flowing through Tibet, India, and Bangladesh. One of its most notable geographical features is the 'U' turn it takes near the Namcha Barwa mountain peak, which is part of the Himalayan range. This turn is crucial for understanding the river's course and the topography of the region.
Namcha Barwa, with an elevation of 7,782 meters, is one of the highest peaks in the Himalayas and is located in the Tibet Autonomous Region of China. The river's 'U' turn near this peak is a result of the complex geological and tectonic processes that have shaped the Himalayas over millions of years. The river's path is influenced by the mountain's presence, which forces the river to change its course, creating a significant bend in its flow.
This 'U' turn is a critical feature for several reasons:
1. **Geographical Significance**: It marks the entry of the Brahmaputra into Arunachal Pradesh, a state in northeastern India.
2. **Ecological Impact**: The river's course through this region influences the local ecosystem, affecting the flora and fauna of the area.
3. **Cultural and Historical Importance**: The river and its course have been significant in the cultural and historical narratives of the region, influencing the lives of the local communities.
Understanding the geographical features and the course of the Brahmaputra River is essential for students of geography, particularly those studying the topography and river systems of the Himalayan region. The 'U' turn near Namcha Barwa is a prime example of how natural geographical features can influence the course of major rivers, shaping the landscape and the lives of the people who inhabit the region.
In summary, the correct answer is Namcha Barwa because it is the mountain peak near which the Brahmaputra River takes its significant 'U' turn, marking its entry into Arunachal Pradesh. This geographical feature is a key element in understanding the river's course and the topography of the region.