Another name for the Darius River (likely a river in Central Asia or the Middle East, historically significant to the region).
From Persian origin, 'darya' means 'river' in Persian and related languages. The term reflects ancient geographic and linguistic naming conventions of the Eurasian regions.
In Persian and many South Asian languages, 'darya' simply means river, so you see it in many place names like the Amu Darya—it's like how 'river' appears in English geographical names, but with a completely different language base.
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