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Hayots Dzor (Armenian: Հայոց Ձոր, literally "the valley of the Armenians") or Eruandunik (Armenian: Երուանդունիք, from the name of the Orontid dynasty) was a canton (gavar) of the province of Vaspurakan of historical Armenia encompassing the area to the southeast of Lake Van, namely the valley of the Khoshab (Hoşap) River. It was bordered by the cantons of Rshtunik to the southwest, Tosp to the north, and Kughanovit to the east. Armenian folk tradition holds the region to be the site of the legendary battle between the Armenian patriarch Hayk and the Babylonian ruler Bel. Hayk is said to have founded the fortress of Haykʻ or Haykaberd at the site of the battle, in honor of which Hayots Dzor was named.
The inhabitants of region irrigated their fields using the Khoshab River and the Shamiram Canal, which was built during the time of the Kingdom of Urartu. Hayots Dzor was populated almost entirely by Armenians until the 1890s, when Kurdish tribes began to settle in the area following the Hamidian massacres. As of 1911, there were 12 monasteries monasteries in the region of Hayots Dzor, five of which were standing and seven of which were in ruins. Around 10,000 Armenians lived in Hayots Dzor before the Armenian genocide, when the Armenian villages were destroyed and their inhabitants massacred or deported.
According to Manvel Mirakhoryan, who traveled to the region in the late nineteenth century, the Armenian-populated villages of Hayots Dzor were as follows: Agrak, Atʻanantsʻ, Anggh, Ankshtantsʻ, Aṛegh, Astvatsashen, Aradentsʻ, Berdak, Zernak, Trkʻashen, Ishkhani Gom, Kaṛnurd, Khachʻ, Kharakantsʻ, Khekʻ, Khndrakatar, Khosp, Khorgom, Kalbalasan, Karmrakʻar, Kem, Kendanantsʻ, Kězěldash, Kghzi, Hermeru, Hilunkʻ, Hirch, Hndstan, Mashkatak, Margs, Mulkʻ, Nanik, Norgyugh, Vochkhrantsʻ Verin, Vochkhrantsʻ Nerkʻin, Pahantsʻ, Pzhnkert Verin, Pzhnkert Nerkʻin, Pltentsʻ, Spitak Vankʻ, Surb Vardan, Vahrantsʻ, Trni, Urtʻuk, Pʻakatuk, Kʻaravantsʻ, Kʻerts, and Kʻeoshk.
- Hakobyan, Tadevos Kh.; Melik-Bakhshyan, Stepan T.; Barseghyan, Hovhannes Kh. (1991). Հայաստանի և հարակից շրջանների տեղանունների բառարան [Dictionary of toponymy of Armenia and adjacent territories] (in Armenian). Vol. 3. Yerevan: Yerevan State University Publishing House. p. 842.
- "Հայոց Ձոր" [Hayotsʻ Dzor]. Հայկական Սովետական Հանրագիտարան (Soviet Armenian Encyclopedia) (in Armenian). Vol. 6. 1980. p. 200.
- Tatoyan, Robert (3 December 2018). "The Churches and Monasteries of Hayots Tsor". Hetq. Retrieved 6 April 2022.