In this section the mahabharata, krishna talks about doing ones duty

the first settlements began along the huang river because of the importance of the huang river in the beginning of china. it goes back to the story, “the tale of emperor yu”, which references the tale of the great flood, which was caused by the huang river and was believed to create and influence china’s making.

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there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.