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Which river divides the South Bihar Plain into two physiocultural units?

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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 Son River is the river that divides the South Bihar Plains into two distinct physiocultural units: the Ganges-Son Divide in the west and the Magadha-Anga Plain in the east.1