Dordnu or Dorni is a village in the Zangezur uezd of the former Yelizavetpol (Ganja) governorate, later in the former Gafan district, and currently in the Syunik province. The provincial centre lies 27 km to the northwest of the town of Gapan, at a height of 1,280 m above sea level. The settlement was integrated into the administrative area of Armenia following the establishment of the Zangezur uezd in Soviet Armenia on 31 August 1921. It was marked on the five-verst map of the Caucasus.

The village was inhabited by 16 Azerbaijanis in 1831, 181 in 1897, 363 in 1904and 327 Azerbaijanis in 1914. In 1918 the Azerbaijanis were deported having been exposed to the aggression of Armenian armed units. The Armenians removed from abroad were settled there beginning from 1918–1919. According to the Turkish historian Fahrettin Kirzioghlu, the people who spent winter in the Ganja sanjak and summer in Zangezur in 1588 was called “Dordnu”.

The toponym was coined on the basis of the ethnonym “durt” (dort – I.B.) of the Gypchag origin.

The village was renamed “Antarashat” by the decree of the Presidium of the Supreme Soviet of the Armenian SSR dated 20 June 1949. According to the law “On the administrative-territorial division of the Republic of Armenia” dated 7 November 1995, it was integrated into the administrative area of the Syunik province.

Geographic coordinates: latitude: 39°18’ N., longitude: 46°19′ E.