The Great Indian Plains is located between the Himalayas and the peninsular India. The rivers originating from the Himalayas (i.e. The Ganga; The Yamuna; The Indus, The Brahmaputra; The Kosi etc) and those rivers which are peninsular origin have added fertility in this region by depositing alluvial soil. On the basis of structural characteristics and slope, this region can be divided into four parts which is discussed below:
• Badar: It is found in the foothills of the Shiwalik with a remarkable starts from the Indus to the Tista. It is a porous and pebbled plain which has been created by the depositing of granules and pebbles brought by the rivers descending from the Himalayas which also known as the ‘alluvial fan’ of the Shiwaliks.
• The Tarai Region: It is found in the south of the bhabar region which is consist of fine sand and mud.The rivers that disappear in the bhabar region re-appear on the surface in the tarai region. Earlier, it was covered with dense forest but now region being changed into agricultural land after deforestation.
• Bangar: It is made up of old alluvial soil. It is higher than Khadar. The expansion of the bangar region is found in the region between two rivers (Doab). For example- The Ganga- Yamuna Doab and the Plains of Satluj. It has two regional types- Barind Field and Bhur Area. The barind field is situated in the delta regions of Bengal. It was created in the Pleistocene period then it was raised up and it has become an area of laterite soil after erosion.
• Khadar: It has been made by the deposition of new alluvial soil and is rather low land. It became fertile because of flood water reaches every year. Bihar, Eastern Uttar Pradesh and West Bengal are come under Khadar region.
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