<Li> The gangetic alluvial region in the west </Li> <Li> The Vindhya alluvial region in the centre </Li> <P> Ganges enters West Bengal near Rajmahal and then flows in a south - easterly direction . It divides into two near north of Dhulian in Murshidabad district . One branch enters Bangladesh as the Padma or Pôdda, while the other flows through West Bengal as the Bhagirathi River and Hooghly River in a southern direction . The Bhagirathi is the main river in West Bengal which flows past some of the important cities like Murshidabad, Baharampur, Nabadwip, Chinsura, Chandannagar, Srirampur, Howrah, Kolkata, Diamond Harbour and Haldia . It empties its water into Bay of Bengal near Sagar Island in the South 24 Parganas . </P> <P> The Mayurakshi, Ajay, Damodar, Kangsabati, Rupnarayan and their tributaries which rise in the Western plateau and high lands flow eastwards through the different districts of West Bengal and joins the Bhagirathi on the right bank . The Mayurakshi, which is fed by tributaries Brahmani, Dwarka, Bakreshwar and Kopai joins the Bhagirathi near Kandi, Murshidabad, the Ajay, which rises in the hills of Bihar, joined by the Kunur, flows down the plateau fringe, marking the boundary between Bardhaman and Birbhum districts joins it near Katwa and Damodar, with its small meandering distributaries, small streams, Khari, Banka and Behula joins the Bhagirathi near Uluberia . The Damodar is known as the sorrow of Bengal, is now controlled by making the Damodar Valley Project . The Dwarakeswar and Shilabati rivers join to form Rupnarayan and the Kangsabati and Keleghai rivers join to form the Haldi . The Rupnarayan and Haldi fall into the Bhagirathi in the East Midnapure district . The Subarnarekha River after flowing for a short distance in West Bengal reenters into Orissa . These rivers carry with them plenty of water thus keeping the Bhagirathi river submerged with water throughout the year . The rivers along with water carry silt and sand eroded from the western plateaus and deposits them in the Bhagirathi and the rivers themselves . This silting is causing great inconvenience for the Kolkata Port and often result flooding in the years of heavy rain . </P>

Name the rivers that have made the plains of west bengal fertile