The Brahmaputra Irrawady and Mekong rivers originate in Tibet and flow through narrow and para...........

Assam Geography and Environment

The Brahmaputra, Irrawady and Mekong rivers originate in Tibet and flow through narrow and parallel mountain ranges in their upper reaches. Of these rivers, Brahmaputra makes a “U” turn in its course to flow into India. This “U” turn is due to

Uplift of folded Himalayan series

Syntaxial bending of geologically young Himalayas

Geo-tectonic disturbance in the tertiary folded mountain chains

Both (a) and (b) above

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Explanation:

Before entering India, Brahmaputra takes a U turn in Nyangtri of Tibet. In that place the great Himalaya mountain system takes its syntaxial bend and turns southwards. As a result the river takes a 180 degree U turn and enters India through Upper Siang of Arunachal Pradesh. So, that Great Bend of Brahmaputra is a result of syntaxial band of eastern Himalayas.