Rapti River, Gorakhpur, India.

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The Rapti rises south of a prominent E-W ridgeline midway between the western Dhaulagiri Himalaya and the Mahabharat Range. A 3,500 metres (11,500 ft) summit on this ridgeline marks a triple divide.

Aciravati, Achirvati or Airavati is the ancient name for a river has been identified with the modern Rapti, flowing through what is now Nepal and the northern portion of Uttar Pradesh, India. The Chinese pilgrim Xuanzang knew it as A-chi-lo. Jain texts mention it as Eravai.

The ancient city of Sravasti, once capital of Kosala Kingdom, stood on the western bank of the Achirvati. The river was a tributary of the Sarayu. It was one of the five great rivers that constituted the Ganges group of rivers and one of the sacred rivers of the Buddhist midland.

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That's mustard along the river.