(c) Damodar River is called ‘biological desert’ on account of its pollutants. Biological deserts are those types of deserts where the biological productivity is completely absent or is negligible. Damodar River is a river flowing across the Indian states of Jharkhand and West Bengal. Rich in mineral resources, the valley is home to large-scale mining and industrial activities. Earlier known as the‘Sorrow of Bengal’ because of its ravaging floods in the plains of West Bengal, the Damodar River and its tributaries have been somewhat tamed with the construction of several dams. It is the most polluted river of India.