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In page Amu Darya:

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In classical antiquity, the river was known as the Ōxus in Latin and Ὦξος (Ôxos) in Greek — a clear derivative of Vakhsh, the name of the largest tributary of the river.[1] In Sanskrit texts, the river is also referred to as Vakṣu (वक्षु). The Brahmanda Purana refers to the river as Chaksu which means 'an eye'.[citation needed] The Avestan texts too refer to the river as Yakhsha/Vakhsha (and Yakhsha Arta ('Upper Yakhsha'), referring to the Jaxartes/Syr Darya twin river to Amu Darya). In Middle Persian sources of the Sasanian period the river is known as Wehrōd[2] (lit. 'good river').