Indo-Gangetic Plains
The Indo-Gangetic Plains is the most important zone in terms of human concentration in India. It is a vast enclosed basin of numerous small and large rivers, separated by alluvial divides. The western section, comprising Punjab, Haryana, Chandigarh, Delhi and western Uttar Pradesh, is slightly higher in elevation, over 150 metres (m) than the eastern section of the plain. Geologically, the whole region is made up of alluvium brought down by the Himalayan rivers.

Agriculturally, the most important region is the Punjab plain. Generally, the soils of the region are alluvial with variations of bangar and khadar. The Haryana plain, which also includes Delhi, has soils which are mostly sandy and calcareous.

The Upper Ganga plain is a vast stretch of the Indo-Gangetic Plains, where the rivers play an important role and have a definite influence over the area. In general, the soil of the region is alluvial but variations exist in the upland and lowland areas. The Middle Ganga plain is the transitional zone between the Upper Ganga plain and the Lower Ganga plain. The Lower Ganga plain extends over Bihar and West Bengal and has a higher rainfall. It has an elevation below 75 m, and has been divided into six micro-regions: north Bihar plain, south Bihar plain, Barind tract, Moribund delta, Proper delta and the Rarh plain.

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Techniques prevalent in this region
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People who harvest rain

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