Discussion
Which of these rivers does not flow into the Bay of Bengal?
Answer: B
Correct answer: The Narmada
The Narmada flows west into the Arabian Sea; the other three flow east into the Bay of Bengal. The reason is structural. The Deccan plateau tilts gently eastward, so almost every peninsular river - the Mahanadi, Godavari, Krishna and Kaveri - rises near the western coast and crosses the entire peninsula to the east, building a large delta at its mouth. The Narmada and the Tapi are the exceptions, and both flow through rift valleys - the Narmada between the Vindhya and Satpura ranges - troughs formed by faulting. They follow a fracture in the crust rather than the regional slope. That also explains a second difference: both form estuaries rather than deltas, because they carry little silt and discharge into a subsiding coast with strong tides. The Narmada is about 1,312 km long, rises at Amarkantak, and carries the Sardar Sarovar dam.
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