Thomas A. Carlson (ed.), "Warthān" in last modified August 9, 2017, http://syriaca.org/place/2954 Warthān ورثان A city on the river al-Rass 39.57459 47.721084 Attestation of name ورثان in the Kitāb al-buldān of Aḥmad ibn Abī Yaʿqūb al-Yaʿqūbī. Attestation of name ورثان in the Kitāb al-aʿlāq al-nafīsa of Aḥmad ibn ʿUmar Ibn Rustah. http://syriaca.org/place/2954 https://pleiades.stoa.org/places/884224 https://pleiades.stoa.org/places/884224 Kitāb al-buldān Aḥmad ibn Abī Yaʿqūb al-Yaʿqūbī 271 Kitāb al-aʿlāq al-nafīsa Aḥmad ibn ʿUmar Ibn Rustah 89