The Hari River (Dari: هری رود, romanized: Harī Rōd; Pashto: د هري سیند) or Herat River is a river flowing 1,100 kilometres (680 mi) from the mountains of central Afghanistan to Turkmenistan, where it forms the Tejend oasis and disappears in the Karakum Desert.
In western Afghanistan the Hari Rud flows to the south of Herat. The valley around Herat was historically famous for its fertility and dense cultivation. After Herat, the river turns northwest, then north, forming the northern part of the border between Afghanistan and Iran. Farther north it forms the south-eastern part of the border between Iran and Turkmenistan. The Iran–Turkmenistan Friendship Dam is on the river.
The Rigveda is said to have recorded the Hereyrud as the River Sarayu. The river Horayu is also mentioned in the Avesta. A Buddhist monastery hand-carved in the bluff of the river Hereyrud existed in the first centuries during the prevalence of Buddhism. The artificial caves revealed testimony of daily life of the Buddhist monks.
- George Rawlinson (1873). The sixth great Oriental monarchy; or The geography, history, & antiquities of Parthia, collected and illustrated from ancient and modern sources. pp. 69, 444(index).
- Shroder, John F. (2016). "Hari Rud – Murghab River Basin". Transboundary Water Resources in Afghanistan: Climate Change and Land-Use Implications. Saint Louis: Elsevier. pp. 410–412. ISBN 978-0-12-801861-3.
- Parvand News Jan 3, 2001
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- Lithuanian archeologists make discovery in Afghanistan, The Baltic Times, May 22, 2008; Archaeologists make new discoveries about ancient Afghan cultures, Top News, 23 May 2008.