The Heray Rud River (Dari: هری رود Hari Rūd, Heray Rūd, i.e. "Herat River") is a river flowing 1,100 kilometres (680 mi) from the mountains of central Afghanistan to Turkmenistan, where it disappears in the Kara-Kum desert. Rud means "river" in Persian.
In Turkmenistan it is known as the Tejen or Tedzhen river and passes close to the city of Tedzhen.
In western Afghanistan the Herey 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 records 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.
- UNESCO: Minaret of Jam (Press Release No.2002-41) and Minaret and Archaeological Remains of Jam (World Heritage List entry).
- University of Texas: A map showing the river (as 'Hariru').
- A mention of the Tedzhen river (inaccessible on 2013-06-26).
- The sixth great Oriental monarchy; or The geography, history, & antiquities of Parthia, collected and illustrated from ancient and modern sources by George Rawlinson, 1873; pp.69, 444(index).
- Parvand News Jan 3, 2001
- Early Aryans of India, 3100-1400 B.C. By S. B. Roy Page 76
- Legend of Ram: antiquity to janmabhumi debate By Sanujit Ghose.Page 77
- 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.