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What kinds of soil are found in the North Bihar Plain?

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The Mahabodhi Temple at Bodh Gaya, Bihar, India, features a tall, intricately carved central spire surrounded by smaller shrines, trees, and gardens. — Bihar Mahabodhi Buddhist temple, built in the 2nd century ce, Bodh Gaya, Bihar, India.

The North Bihar Plain is a flat, alluvial region characterized primarily by new alluvium deposited by rivers flowing from the Himalayas. The composition of this soil varies by location:1

West of the Burhi (Old) Gandak River: The soil is chalky and light-textured, consisting mostly of sandy loam.1
East of the Burhi (Old) Gandak River: The soil is nonchalky and heavy-textured, consisting of clay and clay loam.1

This region is part of the broader Gangetic Plain and is frequently shaped by the flooding of rivers such as the Gandak and the Kosi.1